In my experience, the Springfield Armory "loaded" series, the S&W offerings and the Para Ordnance SSP are the best values in terms of high quality, reliable, accurate 1911's in the $600-800 price range. Kimbers are very good, too, but tend to run a bit more money. I don't have any personal experience with the Taurus and Dan Wesson offerings, but I hear good things about them. While I love Colts (I own four, and my CCW gun is a Colt CCO), my experience is that they aren't typically good "value" because they cost more to begin with, and often need some additional work to be as reliable as the offerings from SA, Para, Kimber, etc. Bottom line is that you'll probably do fine with any of the following (in alphabetical order):
Dan Wesson
Kimber
Para Ordnance
Smith & Wesson
Springfield Armory
Taurus