Hello, I have the possibility to buy a second ASUS GTX 780 DIRECTCU II(used) for $345. Would it be a better idea to wait for the 800 series to be announced, or would it be smarter to go SLI, save money but potentially have driver issues, and more heat/power/noise? I ask this because I have never had a SLI setup, but I heard that the new GTX 880 is not going to be that much faster than current GPUs (rumors). So, what do you think? (PSU is a Corsair 850W 80+GOLD, so no problem there). PS: I am playing at 1440p/120Hz, and the second GTX780 would certainly help in some games.