Right now in the Hot Deals section there is a
GTS250 512MB for only $99 after rebate. The 260 is certainly faster, but at $99 that's a very good deal. You could get two of them if you can run SLI.
And in no way am I trying to talk you out of anything Nvidia, if you have your heart set on Nvidia then by all means go for it. But, there is also a 4890 for sale at
$156.xx (or it could be ~$175, there seems to be some discussion in that thread on it) after Live Cash back, coupon code, and rebate. I know you said Nvidia based, but that is such a good deal you should at least know about it.
Good luck with your new card. :thumbsup: