Good luck on the build. Check prices carefully. A good, name brand AR can be found like someone said, in the 600 to 700 range. Prices have come down recently, at least that's true in my neck of the woods. S&W ARs are a prime example. With a build, using good parts, it will be hard to get out for under that price. Then, unless you have all of the parts from a reputable company like, Palmetto, Colt, S&W, etc., you end up with a "mutt". Hard to recoup money on a build, even with the best of parts. You have to find someone very knowledgeable on ARs and it would have to be someone who wants exactly what you built. Otherwise, they'll just buy the parts themselves and build or buy a complete brand name gun. Just food for thought. I ran into this when I built mine. Had to separate the lower and the upper, basically part them out to break even.