quad 9550

Guys, I need help upgrading mi rig. I got 350 bucks, and I can't decide between changing to a quad 9550 (250$) + geforce 9800gt (100$) or going with a radeon 5850 (300$) Personally, i would prefer not to buy the quad, because I want to hop to i7 soon.. The thing that is bothering me, is that my...