How ia this possible? Less price still more performance than a 780ti.Yes r9 290 in crossfire proves to be more powerful than a single 780ti.
You never mentioned anything about crossfire dude.. you just said a 290 is more powerful than the 780ti which is not true.
You can wait one more month can't you?I suggest you do.
If you want them now no matter what,i think 2 cards in SLI/CF would be better than one for 144hz monitor.
780(non ti) or 290.Your choice.I'd personally go for 2 780s