IMO, save for an additional 2 weeks. I heard graphics card may have a slight drop in price in that period. Besides, performance wise, you would be better off saving for 1 8800GTS 640MB in the long run anyhow. Even without getting a second, 1 is more than enough for future games to come+ theres a substantial performance difference.
So, I want more performance in gaming, but I'm not looking for the best RIGHT now ^_^