I think you could go a great way with SKT 939 then. =)
REASON: 3000+ Venice core will overclock pretty high ive heard, but the 3200 is the best bet. 3000+ is still good, as the best A64 you could get would be a 3700+ SD, which you dont have enough for.
REASON: Good Mobo, reliable to some degree, great overclocking board. =)
REASON: Ah, good ol value ram, you cant really go wrong here, 1gb to start, and another gig for dual channel, so youll have 2gb for those high apps in the future. =)
REASON: 200GB sata drive isnt bad for 90bucks.. =)
REASON: 6800 can be overclocked to 6800GT speeds, and its pipes can be unlocked. good overclocking vid card. =)
Pretty Good setup for 580bucks.... =) I went a Bit over there, but its a pretty decent setup! =) Enjoy!
btw, if you want to lower the 580, you could probably get 512 Ram for 35bucks, and perhaps a 100Gig HD for 50bucks or so. Also, you could get a 6600GT instead if your on a tight budget, which will save you another 20 bucks.. but the performance from 500 - 580 is pretty crucial.. =[