I have a chance to pick up a system that is about 4mos old (verified with receipts) and these 2 vid cards are apart of that. These parts will go towards making a new system and taking the best pieces for my computer.
IMO the x1950Pro and 7600GT OC SLI performance will be very close.
So close that I don't think spending $125 is worth the few FPS you'd gain.
A light OC on the X1950Pro should be a better overall option.
Much better to roll back the game quality settings or turn off AA/AF to get better performance if needed than sink $125 into a 7600GT.
Especially not with $199 8800GT/256MB video cards going on sale over the Holiday shopping season.