Honestly, I don't see the 800's (If they're even going to be called that
) coming out anytime soon.
780 has higher performance ; 770 has better performance per dollar.....
780 has 14% more performance ... at 1920 x 1080
http://www.techpowerup.com/reviews/NVIDIA/GeForce_GTX_7...
770 has 29% more performance per dollar ... at 1920 x 1080
http://www.techpowerup.com/reviews/NVIDIA/GeForce_GTX_7...
I'd invest in twin 770s before id do a single 780.
So to answer your question -- save a couple hundred bucks and pick up a 770 instead, or maybe two for that matter.