Northtech Defense is another that looks good. I think it's $450ish for matched upper/lower. They also have a 'brass' finish. I'd have to see that in person before buying though.
I was all waiting for the guy in OKC who was gonna help us CNC machine our own 80% lowers with our own rollmarks on 'em. That woulda be awesome, I am thinking I woulda bought a good number of those.