Get a pistol that you can get a real holster for, not a generic nylon taco.
Get a pistol that you can get magazines for. Make sure the mags don't eject all the BBs if you bump them on reloads.
Get a pistol that suits the way you game.
Multiple pistols are fine if you can afford them.
It sounds like you want a TM Hi Capa based on your post.
Airsoft, where nothing is hurt but feelings.