Carry what your comfortable with. When you're out and feel the need for more (either guns or ammo) carry more thenext time. JMO, YMMV.
As a full time LEO, with all the crazies coming out of the woodwork, IE the 4 officers ambushed in Washington State , mall shootings, etc.
I've started carying two main handguns a sig 226/40 S&W and a springer in 45 ACP. Makes ME feel better.