As nw333 said, I wouldn't waste my money (again) on Win7 Ultimate, it's not worth the price premium. I also concur with the OCZ PSU comment, I'd rather see you go with a trusted name like Corsair. I'd even go so far as to say that I'd take a Corsair 500w PSU over the OCZ at the same price.
I have win 7 ultimate, and probably going to CF in the future. I am actually still debating whether to get the 6950 used with dual bios and unlock to 6970 for $140 or go with a new 7850/70 for $250 +shipping. I have until Saturday to decide ..
what do ya think