I'd have to go with the M1911. I have three of them, an M1927 Argentine (built on Colt machinery, under Colt supervision, and basically a 1930s-era Colt), a Fed Ord kit gun -- I finished and assembled the parts, and a Kimber Classic (MK I). The latter is my carry gun, the other two currently wear .22 Conversion kits -- a Colt Service Ace on the M1927, and a Ciener on the kit gun.
I also have 3 .45 Colt revolvers, a Colt New Service made in 1906 and two Ruger Blackhawks, one with a 7 1/2" barrel and one with a 5 1/2" barrel.
The latter two guns can be loaded as hot as I care to shoot.