My Kimber Pro Eclipse.
I own 3", 4", and 5" Kimbers, and love them all. I carry the 3" alloy framed ones more, and like the 5"ers at the range, but the steel Commander-sized Pro Eclipse is my favorite.
Springfield 1911 Loaded. I carry a revolver, but this is bar none the easiest semi-automatic I've ever shot, and I shoot well with it. Unfortunately it isn't as easy to conceal. <sigh>
My favorite .45 is my Olympic Arms/Safari Arms Matchmaster 5" Stainless. Iv'e had Kimbers, Colts, Rugers and Springfields, but the Matchmaster,,,what can I say, it is my all-time favorite....