I'f I'm gonna buy a 1911 that I can hang a light on, its going to be one that works, and works, and works, with only a little oil now and then. If I cant put ~2k rounds through it between cleanings, and if it wont run despite having magazine and recoil springs that need replaced, then I'm not gonna bother. The 5" Kimbers I own meet these requirements. The 4" Kimber does not.
Dont get me wrong, its a great CC peice, but if the SHTF, I'm grabbing one or all of my 5" guns, the main reason being the spring lasts a hell of a lot longer. And when its wore out, its easy to change.
Compact handguns with light rails always baffled me. Get the compact for concealability, but hang a light on it to ruin it? With the Surefire X200 on that gun, its just about as long as a 5", so why not go with the full-size model? If you want a compact, why get one with a rail?
If I were in you shoes, I'd get the full-size TLE/RL (if I wanted one with a rail) and carry the Colt. Or, I'd get the 4" Kimber without a rail for carry and hang a light on my Colt.
My $.02. Sorry if I sound like a jerk.