ok i have found out about a little known geforce card called a 7900 gto.  this card is essentially a 7900 gtx, just underclocked as such.  now, there are two versions of this card, be sure to get the one with the 1.1 memory.  having thjis means you can clock this card to a 7900 gtx spec, with identical performance.  having read some bench testing of this card, it actually out scores the gtx in some tests.  considering this card is about 200 dollars cheaper than the gtx, i would say grab it up