John, youll def know when it gets here, in fact as soon as I can order it! I have about two months! UGH!
IAS, I feel the same; buy now, learn it, and build later!
Lots of good guns out there... No reason one cant be found around $650. You may even be able to find one in person at like a BassPro, Cabellas, or the like. One of the more popular ones, which I too had considered was the S&W M&P 15 Sport carbine, with gas piston, flat top receiver, A2 front post gas block and A2 forend, and Magpul MBUS. It also includes a 30 round Magpul PMag. I've seen them online for somewhere around $659 or $679.
I mentioned I'm doin the Olympic Arms, it come highly recommended by more than a few folks, plus there is support much like this forum with the OlyArms.