Not too bad on the build, but did you already order them? PSU should be okay for the 8600gts, but it's not on the favored list of PSU manufacturers. I have a 420w Raidmax running a x1800xt on a single core 3200+, 2 gig's DDR 3200, 2 DVD's, 1 HD and has been okay up to this point (2 years old). I bought this when I wasn't informed like I am today, so I wouldn't of bought it then if I knew what I know now.
The only few things that I would've changed was to drop down on the CPU and get a 3850 or 3870 GPU instead of the 8600gts, but that is me. You'd get better gaming on a 3850/3870 and a x2 3800 or better CPU.
Edit:
Also I'd get a different mobo, since it doesn't look like your going to SLI or Xfire. You could get this mobo instead:
MSI K9A2 CF-F AMD Phenom Socket AM2+ 2000 MHz PC2-8500 (DDR2-1066) ATX Motherboard Retail
http://www.zipzoomfly.com/jsp/ProductDetail.jsp?ProductCode=10007272
$92 shipped and is Phenom friendly, since you might want to upgrade later next year or whenever.