Well first off, find out what mobo that is.. Sounds like a cheap mobo. Second, no system out there is future proof, nobody really knows whats gonna come out or what gonna happen. Just look at the 7800GTX's, They are getting bottlenecked by even the top of the line AMD FX series CPUs. You could drop the CPU down to a 3200, and up the video card to 6800 maybe even a 6800gt, if the prics drop like there suposed to by the time you buy.
AMD X2 555 unlocked to X4 B55 @3.5 | 8GB GSkill Sniper series | Asus M4A89GTD Pro/Usb3 | 2x XFX HD6850 | 600W OCZ ModXStream | Thermaltake V9 Black edition | Corsair H50 | 2x 1TB Samsung HD's