I should have been a little more specific. I am not looking to make a super cheap AR, I am looking to create a rifle as accurate and reliable as a Colt/BCM/Daniel Defense or $300-$500 less then they charge, because like anything, I know name/price/reputation drive up prices significantly and in almost everything, you can find less well known items, that are just as good, but significantly less expensive. If I can build an AR for $800, that is every bit as good as a top tier AR, I am fine with that. If it will cost me $1100, then I might as well just buy a top tier for another $100 or so.
Of course I am willing to make small sacrifices to do this. So if I can get a cheaper rail, then a DD Omega, which weighs an extra 1/2 an ounce, I am willing to do that. It's all about getting the best bang for my buck.
I could just buy one, but I really want to build one. I want to learn how it functions, so I can repair it myself if needed.