Let's clear up a couple of misconceptions. It's good you laid it out though because I hear this a lot. No offense meant by any of this either (more disclaimer at the bottom).
In order…
1.
I'd steer clear of any 10mm's built on 1911 frames. 1911 was designed for a low pressure cartridge; 10mm is MUCH higher pressure. Lots of problems with cracks on the (frame? slide? --I'm not a 1911 guy, but am a 10mm guy).
Original 1911's that have been "converted" to 10mm do have issues with pressure, extraction, and other malfunctions. That's true and generally affects older 1911's and those that were built specifically for other calibers (like .45ACP). However, many modern 1911's chambered in 10mm have been built from the ground-up by folks like Wilson Combat, STI, Kimber, Rock Island Armory, etc., specifically to withstand the pressure and function perfectly well. There's a big difference between converting a pistol to 10mm versus building a pistol to 10mm. The same thing applies to Glocks or any semi-auto pistol. For example, despite that it fits, you don't want to simply drop a 10mm barrel into a Glock 21 slide because the extractor will cause failure-to-feed problems, the 17# spring will cause heavy recoil and shorten the life of the firearm (if you plan on using hot ammo like Buffalo Bore or Doubletap anyway). Point is, 1911 is a perfectly suitable frame for 10mm.
2.
So I have a Smith 1006, hands down the most robust 10mm. It is actually overbuilt for the 10mm. The .45ACP version they make (4506) is WAY overbuilt. I think they use 'em for custom mods for hot .45 wildcats.
It's a great gun indeed, but it's not "overbuilt". It's barrel specs are almost identical to it's sister Colt. That's good though because it means it can handle hotter loads safely. This is the same premise as buying a .38 or .357 that is rated for +P ammunition. Using the term "overbuilt" doesn't really mean anything in this context.
3.
I also have the G20SF and a G29. I like 'em both. Generally, the 1006 can handle the most brutal handloads though. The G20 needs 'em backed off just a bit, and the G29 just a bit more. But 1250-1300+ fps out of a 10mm using a 180gr. Gold Dot bullet ain't no joke.
The G20 can handle the hottest loads on the market, same as many other 10mm pistols. Again, it's like saying it can fire +P ammunition. Some manufacturers do this while others don't. Generally the ones that don't are opting for a lighter gun, perhaps marketing it more towards being a carry weapon. Those that build to heavier dimensions (like Glock, Wilson Combat, et al) are also marketing to the hunting and competition crowd. It's a trade off - weight versus load. For the record, the G20/21 frame doesn't care. The G20 "upper" is the only part that matters. If you've got a G21 for example, swapping out the recoil spring (say, for something heavier like 20#) and a 10mm slide, barrel, ejector, etc (see the guys at Lone Wolf Dist) will get you two guns for the price of one-and-a-half and you'll be able to swap uppers from .45 to 10mm no problem and shoot the hottest loads of each no problem. For hunting, obviously go with a longer barrel (like 6") to generate even more pressure and muzzle velocity from the 10mm.
3.
Both the 1006 and other Smiths, in addition to the G20, were the ORIGINAL platforms. What I mean is, the .45ACP G21 and 4506, Glock and Smith respectively, were both designed to handle 10mm FIRST and were modified to handle .45. That's smart. The 1911, however, was designed as a .45. So 10mm I suspect stresses the hell out of it. It is also the reason, I was told and read numerous places, that 10mm ammo is watered down now. While the G20 and 1006 can handle stiff loads, the weak link was the 1911, and so ammo had to be engineered for the weak link. Hence why factory 10mm defense loads are seldom more than 100fps hotter than .40 standard ammo.
Historically, the Glock 20 and 21 came about at the same time (as did many other .45 and 10mm counterparts) but they are in fact different guns. Yes it's true the frames are the same, and this is one of the things that makes Glock so versatile, but the specs for the Glock uppers are different - different enough that as I said you don't want to mix and match barrels and such without swapping out several other components at the same time (it's simple, but needs to be done or you'll damage the gun, or your wrists, over time). It's not accurate to say any of these guns were built first to handle one of the other. To save money and aid in compatibility, manufacturers will often reuse parts from one model to another (car and electronic manufacturers do this too). But the G20 and G21 are in fact distinct firearms, despite the fact you can evolve one into the other by making various modifications.
Related to ammo, 10mm like any other ammo comes in different flavors. Before the FBI gave up on 10mm entirely they tried "watered down" ammo to see if that would solve their other training issues. Since then, "watered down" 10mm still has it's place. It's great for target shooting and carry defense. For hunting the flatter trajectory of hotter loads over longer distances works better. Still, round-for-round there's much more "watered down" 10mm on the market because you'll shoot more of it at the range. That's a good thing. Buffalo Bore, Core-Bon, Doubletap and many others make plenty good hotter 10mm for hunting and defense.
4.
10mm is my favorite pistol round: it's accurate, long range, hard hitting. Very versatile in loads with 155's to 180's shining in my opinion, 200FMJ's good for wilderness handgun. Hands down my favorite handgun to shoot, though I carry a G27 .40 more often, truth be told.
Can't argue there
5.
There are a few other makes, EAA? Never used them. Just prefer the three I have, as they are considered the cream of the crop when it comes to 10mm's.
10mm is becoming popular again with more folks going pistol hunting and an increase in the number of mods from even more reputable third-party folks. Reminds me of when Merlot came back in style a decade or so ago. I think a movie had something to do with it. It was huge in the 70s too. Point is, stuff comes around. Maybe it the last vestige of the 80s rebirth due to Don Johnson and his Bren Ten. Who knows. What was the popular gun of the 90s? That's probably due next!
6.
Good luck, but I'd HIGHLY recommend you don't mess with 10mm if you don't handload. For many reasons, one it's expensive to buy factory, two the factory loads are neutered. Unless you get the 1911, then they are kind of made for it. But you'd be better off with a .40 in that case! If you don't handload, the .45ACP is a damn good alternative, cheaper with more available loads.
Again, factory loads are not necessarily neutered but because 10mm has so much versatility, it's available in more formats. The most common format is a lighter load because more of those bullets go down range than anything else. So you do need to check out grain weight and FPS more so on 10mm than say .223 or .45, but no more than you might look for "high velocity" on .22LR or +P on your .38. Check out gunbroker or wherever for tons of choices.
No gun is more suited than any other for 10mm provided that the gun isn't a hack of something else to squeeze in 10mm. That's not the case at all with any of the brands mentioned by name in this thread. Every one has a 10mm model that's perfectly suited for 10mm loads of all types. Barrel length plays the biggest role in pressure anyhow because longer barrels compress more gas to propel the bullets further - so getting a 4.5" Glock is going to shoot any bullet slower than the same bullet coming out of a 6" barrel.
The whole purpose of 10mm isn't that it's better than .40, .41 or .44 Mag or even .357 Mag. It's beauty is simply that 10mm packs enough punch that only makes it comparable to these rounds, allows for a smaller and lighter shell, which means you can use it in a semi-auto and pack a heck-of-a lot of ammo into a single magazine. You can't do that with .44 Mag, not that there's anything wrong with that round either. For personal defense, not everyone wants to carry a Dirty Harry. For hunting, some folks want to carry their city gun into the woods. The point of 10mm fills a niche. Don't let anyone talk you out of it
(No offense meant to Strykervet! Wanted to clear up some misconceptions, that's all. You have excellent taste in weaponry!)