I would agree with saying the 980 is not worth the upgrade from a 780TI. However, you may be interested in the next generation of cards. It's going to be cheaper to go with the SLI. That's where you're going to get the most bang for your buck. Depending on what resolution you're on, I would recommend saving yourself the cash, and going with the SLI. If the next gen cards really interest you when they are released, you can always sell the two 780ti's.