Well most if not all of the 7600 GSs are passively cooled, ie no fan. And would
be a nice performance increase over your 9600XT. But I think you should give fans another chance. They last a while. I still have a Ti4200 with the original fan, getting a little noisey, but its still spinning.
You would need to upgrade to a PCI -EX (x16) motherboard in order to use either of these cards though...