If you're going to get a Seagate hd, I'd suggest one with perpendicular recording and a 16mb cache. It'll be faster. If you do, the 320gb one has the best price/capacity ratio I believe. I personally would get a Fortron 450w psu over that, but that one might be ok. Everything else looks good except get some DDR2-800 ram instead of 667 since you want to OC.
AW9D-MAX is supposedly a good 975x board...but you're getting an e6400, so I'd say stick with the p965 chipset. Also, that vid card isn't great but it's good for the price. I'm guessing either you're not a big gamer or you're just wanting something to hold you over till dx10's drop in price?