If you're desperate for an AR and don't expect the sky high prices to come down then that C15 would have been a good buy especially with four mags. I'd recommend waiting and maybe you can get a S&W Sport for about the same price - or better yet a PSA (just before the panic I put a KISS version together for about $700).
The biggest issue with assembling an AR isn't so much getting the parts together right - it's getting the right parts together.
You'll remember the quality of a gun long after you forget how much you paid for it.
US Army 1966-69, VFW Life Member, Retired Geek