Springfield Loaded series would be the one I would look for. They have upgraded sights, triggers, beavertails, and safeties for around the $800 you are looking for. I wouldnt shy away from a used Kimber or S&W either. If I were looking for a 1911 right now, I would look at the Dan Wesson 1911s, they are about the nicest you can find for the price you pay.