@ lethal , go with ur intel setup, why thinking so much, you have the best gaming config for ur budget..yeah go for 9600gt, seriously you 'll regret
ur decision if you buy ati 4670(hardly .5-1k price defference but whole systems performance in game will be like much less), but again buy a good PSU(avoid zebby or simply take a little risk
)..
also if you are thinking of amd rig so that you can upgrade then its no sence...as even after one years or so if u think of upgrading then by that time much more good options will be available, you can sell ur current chipset and buy a better mobo for 2.5k.. these thing are considerable only if you upgrade mobo/proc < each year(+-) , but with ur budget i can assume you are not that kind of creature..