ADCO firearmsThis is one of the most respected AR sellers on the board.
They will treat you right, and make sure you get what you need,
not necessarily the most expensive rifle they stock.
Rock River Arms guarantee 1 MOA on most of their rifles and 3/4 on the varminters.
I would suggest you look at the A2 standard, or A4 standard (1:9 rifling), or if you really want to look at the higher end rifle, the Varmint A4 1:8 rifling (3/4 MOA guarantee) or A2 National Match (it is a competition rifle). None of them are more than $850, except the National Match.
If you like any of these, the folks here can most likely save you at least another hundred bucks by helping you piece your rifle together, by buying it in two parts; a complete upper, and a complete lower, which just pin together and you go shoot. Just ask. It is easy to do, and can help you save enough for a good scope and bipod.