Hey, it all looks good from what I see. I would say try getting one of the new Quad Cores for better overall and thermal performance, maybe up the PSU. But I am sure all will be fine.
Looks good though to be honest, when are you planning on building this rig?
So your obviously building a gaming rig?? My two cents, first off, get a 4870 with GDDR5, and secondly, crossfire/sli will only give you about a 30% increase, so i’d take that in heavy consideration. I’d get a single card for now, and if your not happy, you can always buy another card.