Sounds like you're using bolt guns? I'd consider a .30 TBAC Ultra (7or 9) with a thread over brake. It's just as good if not better than direct thread and you can use it other rifles. I have the 6.5 Ultra 9 and the .30 Ultra 5 and 30CB9 --6.5 is fine through a .30 can. 5.56 is fine through a .30 can. Larger bore suppressors work just fine, they just typically have a deeper tone than smaller bore ones do. Having 'em dedicated is nice though. If you plan on getting more, why not do this? You generally get what you pay for and you certainly wanna buy once, cry once with NFA items. But a good .30 would be better than two half ass dedicated cans, trust me.
Like spife said, I'd go Sico Saker for a semi --it's a QD can but they have a TON of options for it and it's an AWESOME can. The QD mount on it is solid too, zero play. KAC makes a solid mount QD can that's good for precision and hard use and isn't too heavy, but it's costly and I'm not sure if the Saker is better or not. Certainly costs less. Hard to go wrong with much of what Sico makes, they are industry leaders. Just pick the right one for the right application and you'll be happy.
If dead set on a direct thread and wanting to save money and still get a good can that can also take abuse, Elite Iron is great. They do thread over brakes too. VERY well built, solid SS. Not TOO heavy, but not titanium light either. Honest guy, great work. May be able to get two dedicated cans here for a good price.
I wouldn't get a Liberty for a rifle can, but they're my number one choice for .22 cans. I'd stay away from AAC due to CS, though I bet their direct thread cans are pretty good (their 51T mount sucks). Uh, Gemtech, they got bought out, and I'd stay away from anything gimmicky.
Once you get the bug, you'll likely get more cans, so plan accordingly. Try to steer clear of "multi use" cans. I have one, least used can in the lineup.