Current specs include X2 4400+ at 2.5 ghz, ASRock mobo, BFG 6800gt oc agp, OCZ 1 gig platnium ram and OCZ 450W modstream PSU. Would it be wise to upgrade my video card right now to a evga 7900gt KO. I want to be able to play UT2K7 and all the other games coming out at fairly decent settings, or should I wait for the G80 series?