I used to carry a standard 1911, with 7+1. When I started reading about flash mobs, I decided I was undergunned. I now carry a P12, 12+1, and an extra mag. I'm seriously considering buying a Kel-Tec PMR 30, with 30 rounds of .22 WMR. I hate to give up the larger round, but I like the idea of more of them. Mobs are usually undisciplined, so they won't press an attack after they've lost a few (I hope).
Glock 23. .40 Cal. 13+1 and a hollow point will blow a barn door out of a perp.