If you are looking for a GI spec model specifically, the "enhanced features" listed below will disqualify most of these models. You would then want to look at Springfield GI, Para GI, or RIA GI. I don't have a lot of experience with these... Here you have no beveled mag well, iron sights (not 3 dot white nor novaks), no extended beaver tail, no flared ejection port, no skel ham nor trig.
The Smith SW1911 is an excellent gun. Have to add that considering our awesome webhost.... Beavertail, skel ham, skel trigger, flared ejection port. Series 80 firing pin safety, but it works off the grip safety instead of trigger so you may like that trigger better for range use. It has an external extractor, which some people don't like. It's probably closer to $750 - $800 new right now.
The Remington R1 ($600 or so) is a cross between GI spec and enhanced... series 80 safety, larger ejection port. Dovetail iron sights, which may be better at the range for accuracy, but personally I like the 3 dot / combat sights myself. There are enhanced and other models now of the R1.
I would highly recommend the Ruger SR1911 (650 - 700). Ruger is made entirely in USA. It is a 70 series gun, no firing pin safety. This may be better for target shooting, as dropping and carrying isn't a large concern. Extended beavertail, skel round hammer, skel trigger and crisp for out of the box non-PC Smith
Also the STI Spartan (about $700 I think) is a consideration. I have heard awesome thing about this gun, but never shot it.
MOST models are on the 1911 buyer's guide. Check that out here:
Buyer's guide for all you 1911 addicts......