No one recommended crossfire kid.
CoolIce, a 4850 is probably your best bet looking at your hardware. Why do you have a CD-ROM listed in your sig but no CPU?? Also, ignore Rave Tech's answers. WRONG!! I am pretty sure he is clueless about hardware.
BTW, I am pretty sure RaveTech thinks it is "cool" to SLI. What he fails to comprehend after being told many times is that the cards don't scale 100% and therefore performance per price is lower than the 4850 or GTX 260 Core 216. There is really no reason to buy a 9600GSO unless you are building a budget rig, and I can't really see any reason to buy a 9800GT at $149. The 8800GT/9800GT was a great card.....I used to own one. But that was a year ago.