Hmm, well the primary way to kill them is disruption of the nervous system. So I would also go with the large capacity option.
If I need to stop them fast I have to go with a classic. The Thompson M1 subgun with a 75 rnd drum an some Remington Golden Sabers.
For medium range I'd grab a Ruger Mini 14 with 9 30 rnd mags.
Long range would go to the Springfield M25.
REAL long range would go to the Armalite AR30 in .338 Lapua.
CQB range would belong to the FN Herstal P90. Carries 50 rounds, accurate, low recoil while shooting full auto.
Side arm would be an FN Herstal Five-Seven. Uses same ammo as P90 so I can swap em out if I need to. And a Glock 18C for when I need to mow down a few brainless meat bags.
REAL CQB range would go to a nice hard peice of oak studded with steel spikes. A CS battle Mace. A Fallkniven U2, ya I know, but they are just so freakin handy!!! And a Fallkniven Mine Clearance knife for when I need to lay into some stuborn zombies.
Oh and a picture of Diane Fienstein when all else fails.
