The GI models were $400-$450 back about two years ago weren't they? Now the price is around $600, is that correct? Personally I think that the next-step-up model from Springfield Armory, the 'Mil-Spec' series, is a better deal for about $50 more, last I looked. The Mil Specs, compared to the GIs,have better sights, a slightlyhigher/more user friendlygrip safety, and an enlarged ejection port.
My main hangup with the GI series is those tiny sights, but that's partly because I'm 45 years old not 25.