You could save a little money, overall I'm liking your build.
Check out my $850 build here: http://www.squidoo.com/electronicandmore
I'd be looking at an AMD route currently, I'm talking about the Graphics of course. I say this because the 7850/7870 releasing soon provide much more performance @ the price points w/ less power consumption, lower temps and higher overclocks.
Yep, if you did check out my build guide. I'd suggest that you go with the Asrock Extreme3 Gen3 and save some money. As for the the PSU, go with the Antec 650w and save some money but get just as good performance. That or you might as well get an OCZ ZS 750w @ the price you're at.