Stag and S&W have earned a solid reputation at that price range. Wyndham looks good but is new and was a little over $800 locally. My brother is more into AR's than I and based on his recommendation I recently bought a Palmetto State Armory for $760. Mine came with a 1/7 chrome lined barrel made by FN. I have only had it a few days and have not shot it yet, but it looks promising.
http://palmettostatearmory.com/
My brother thinks very highly of them and considers them the most AR for the dollar. Time will tell.