STI, Colt, Kimber in that order. STI are universally well-regarded (even the Spartan, which IIRC is made of imported parts; they take pride in their guns). Colt is… Colt, plus their quality has greatly improved in the past few years according to the accounts of some gunsmiths I read.
I have heard waaaaay too many horror stories of Kimbers (including some truly surprising pictures) in the past few years to trust them. Used to be good before everyone started making "custom" 1911s, then their QC went downhill fast. If you get a good one, or can spend half the price of the gun again to get a gunsmith to work it over, then you'll be fine… but otherwise you'll be unhappy.
Dan Wesson also gets a thumbs-up from me. For half the price of my Baer it's a damn good gun: fantastic fit, smooth as butter, great shooter. The difference between the two guns is in small parts and little details, such as thumb safety fitting and sharp edges on the mainspring housing… and for those small differences (which most people won't notice) you pay a $700 premium.
I've been interested in picking up one of the new S&Ws, but have no direct experience. Hilton has good things to say about those, despite some of the flaws he found.
You are likely to get recommendations for the new Remington R1. I've heard some people who were new to the 1911 rave about it. I've also seen pictures of fit, finish, and machining marks, and I'd recommend you stay clear.
Good links to read:
http://10-8performance.blogspot.com/2011/01/choosing-your-first-1911-some-thoughts.html
http://10-8performance.blogspot.com/2010/07/kimber-warrior.html