Not sure how a 9800GX2 would compare to 2 8800GTSs in SLI, but I would assume it would be pretty close. And, you would save about 60 bones by going with 2 8800GTSs (not counting MIRs), but 1 9800GX2 would free up extra space if in your case. If you have plenty of cash then grab a 9800GX2, if not gra...