To correct the above website address, Brian Bilby of Advanced Combat Pistols can be reached at
www.1911custom.com
As far as production pistols go You've got Colt, Springfield, or Kimber. Unless you want a milspec featured 1911 then it's a Colt or Springfield option.
Of the three above I would pick the Springfield if I wanted the gun out of the box with enhanced features i.e. beavertail, extended thumb safety, nice sights, reliable out of the box with different ammo. I also like the fact that the Springfield doesn't come with MIM parts in critical areas (slide stops/sears/disconnectors/bushings). The Springfield also comes with a metal mainspring housing.
The only place where a Kimber beats a Springfield, for me, is that the Kimber has a dovetail front sight and is dehorned whereas the Springfield does not come that way. Also, the Kimber doesn't come with a two piece guide rod that can loosen up and tie up the gun.
Even then I still pick the Springfield. I have seen too many people get Kimbers that needed reliability work as compared to the Springfield. Most of the time the chambers are too tight, slide stop doesn't work right, and the extractors have improper or NO tension.
For a Milspec one to customize or leave as is I pick the Colt over the Springfield. Personal preference mostly, just like with the enhanced type guns above.
The reason I didn't mention the Colt X guns in comparison to the Kimber's or Springfields is because I have no personal experience with them and don't know anyone who has one that is shooting it to get any feedback.
Not only that but since Colt just raised their prices about 30% and at the local gunshop you pay roughly the same price for a 1991A1 as compared to a Springfield "Loaded" or Kimber Custom there is now no comparison. The Colts are priced to high now unless you can find a used one for a good price....