Probably a Springfield GI, but I have seen some real crummy Springfields lately. I did a quick scan of GunsAmerica, and there are three Norinco 1911s each priced a little over $400.
I don't have any personal experiance with Norincos, but I have seen some good things posted about them....as a basic 1911 that is.
I have seen Rock Island 1911s (Not to be confused with Rock River) for under $300, but I have never heard anything good about them. Haven't heard anything bad about them either. Maybe the low price is scaring people away.