CO2 pistols tends to be too hot for CQB
Green Gas/propane would be preferable and cheaper in the long run
In term of brands, try to get. a TM, or Kwa as they make very solid and good quality pistols. I cannot really talk about KJW but from what I read and gathered here and there, I personally wouldn't want any of them unless they're given to me
We seems to have decent pistols since some time now, probably would be 3rd on my list
As for KWC, Skeleton Sidearm and other less common brands... I wouldn't even touch them with a stick :P
This is my personal opinion though, but it's based on research, and was very pleased with the TM and Kwa I got, so no reasons to look elsewhere really
Marty: what do you mean by pivoting vs direct trigger? (I know close to nothing of real steel firearms)
I have a TM HiCapa (Based on the STI 2011) and its trigger is definitely not what I would describe as "pivoting". Maybe I don't understand what you mean
See how the TM/We HiCapa trigger look: