I understand it's tempting but if you're not in a rush I would seriously just wait to see what the new cards will offer. I'm obviously just guessing but I wouldn't be surprised if the AMD 99xx would cost around the same as a 780 and likely perform ~15% better, it'll be interesting to see if they decide on 20nm or 28nm. Either way it's speculation but I can't imagine would would release something worse and more expensive.