i have a pretty old williamette p4 1.7/512/gf3 ti500 desktop here, and would like to upgrade it to be able to play some recent games, doom3, hl2, cs:s etc being top of my list. i dont care about AA and super high resolutions, just need it to run games smoothly. heck i'm used to playing my games at 800x600 or even 640x480. would going from a herc gf3 ti500 to say a radeon 9600 pro or standard 9800 be much of a benefit based on the cpu i have? or will i be better off getting a new cpu first? (which also means a new mobo+ram, rambus, yuck! --which i cant really afford atm) thanks!