I'd rock a Kel-tec PMR 30.
I was going to say a Five-Seven...but really, many 9mm's can hold 17+1 and the 9x19 is a better cartridge anyway. But THIRTY +1? No, nothing comes close.
(And anyone who looks it up and goes "durr it's a .22" look closer, it's a .22 magnum and I guarantee it would put almost anyone on the ground with one shot. Hell, most people would go down from a pellet rifle.)
TheTaco007: I don't understand why you'd let politics control you like that. Like or dislike things for their own merit, not because your political party de-jour said so. That's called being a moron.
Fantasy weapon?
Sonic screwdriver. 'nuff said.
EDIT: I don't even carry a pocket knife so I doubt I'd actually carry a hand gun...but the sonic screwdriver, I would bring that EVERYWHERE.