[Shooter]

Wow......lots of questions.....all those guns you mentioned are good.......I think IDPA will take any caliber..........You really should try and shoot the guns you are thinking of to see which one suits you.......... 9mm ammo is definately cheaper, less recoil...P99 seems to get a lots of positive responses and although I'm not a Sig guy, my brother is....I personally don't like them......It's gotta be your choice.....I'm sure you are going to get a few more really detailed responses on your questions..........
Good luck.......