I'll have to agree with the above posts, as far as a name brand AR. You can't go wrong with Bushmaster, Rock River Arms, Armalite, D.P.M.S. or D.S.A. They're all good and it will come down to options that YOU want and cost differences.
Rock River Arms gave me the options and price that I was looking for, along with the reputation of usage by the D.E.A., U.S. Marshalls, F.B.I. and Force Recon Marines. /ubbthreads/images/graemlins/grinning-smiley-003.gif
Simularly, Bushmaster is used by U.S. Navy Seals. /ubbthreads/images/graemlins/cool.gif
I purchased a RRA A4 Varmint from Adco Firearms at an "out the door" price of $830. The one that I own is a Tactical Entry model with a 16" SS Wilson Varmint 1:8 twist barrel. Other options included a National Match trigger, Hogue combat grip (green), collapsable stock (green), flat-top upper, free-float tube and CAR Tactial sights.
www.adcofirearms.com
Good luck with your choices!
Good hunting, Bowhunter57