Let's not forget: Rock River Arms, Essex Arms, STI, Caspian and others.
While Kimber makes a great 1911, the new Auto-ord, made by Kahr is actually a really nice gun too, for the money.
The accuracy can be attributed to several things but understand that only a handful of manufactures actually CNC their own frames. Some of the rest of accuracy comes from the fit of the parts and of course the quality of the materials.