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I'm certain you will get a million different answers for this. We have sold a lot of WIndhams, diamondbacks, obviously the DPMS and Bushmaster stuff is alright, although I am not as impressed with Bushmasters as I used to be. If price is a major consideration, you might want to have a look at a S&W Sporter model, should be able to locate on of them in the $600 range, they have a standard front sight and a Magpul Mbus rear, should work with most red dots and such, we have sold quite a few of them, and have never had one come back that wasnt for operator error. The above post is a good one. Decide what twist you want first, especially. That will determine what projectile weight you will be good for.
There are loads of others out there, Bravo, YHM, etc... Good luck, man.