Berettas and Sigs are out due to the aluminum frame. I just don't trust it for holding up to thousands of rounds....or beating them if you run out of ammo.
XD pistols I don't think you can rack without holding down the grip safety so one hand operation is tough. Out.
CZ is nice for the double/single action. Glock, M&P would work. Never shot an H&K so I wouldn't pick it.
I would pick the 1911 in .45 ACP. Balance, grip, natural point of aim (for me) and a big fat 'slow' moving bullet. Just like getting hit by a big truck.
What you really want to think about is suppressing the smell of your brain. Zombies LOVE eating brains and if they can't find you, you don't really have to worry about anything else.
SB