Re: HK45 pistol question...
The HK45C is probably the best to go with if you don't like the new grips on the HK45
The HK45 is excellent to shoot, stays in your hand nicely & is very smooth & accurate.
The HK45C has the smooth grip from the P2000 series and is a bit smaller, but you can put in the same 10 round mags & you can put an extended threaded barrel from the factory on it (or get one that came with it (HK45CT))
I would suggest you see if you can handle them side by side and see what feels good in your hand, as some people like both and some prefer either the HK45 or HK45C