I just heard news about gtx 685 which has more power than gtx 680.I have all parts of my build but havent decided about GPU.I wanna play all games maxed out on 1366x768.So, wait for 690 or 685, or buy gtx 670 4gb?
Go for a gtx 770, pretty much the same gpu as the 680, 100 bucks or so less expensive. Would be able to play almost any game on ultra with a single monitor(Assuming your cpu is appropriate)