I'm currently running a Asus 6870, which is good enough for my current gaming such as GW2, LoL, WoW and Black Ops 2 in a few days. My friend is willing to sell me his GTX 580 for $200 to me, so my question is should i jump on this deal now or just keep my current one and by the time GTX780 release i should have enough for it or at least the GTX770?