A glock 17 can take the 33 rounder too. And pistol calibers aren't that common now a days, as you see. Id carry a .45 since i could get some off local police. Id love a .357 mag, one to the chest should be all it takes. Havent seen 38/357 around though....
May get that dan wesson CBOB at Cabelas.
For a main gun, Id get any rifle i could get my hands on. .308 is a great combat round but id be fighting so many people id need smaller ammo unfortunately. The mini 14 is the way to go, rugged and quick pointinbg for me (much more so than ar-15s)