Im looking to upgrade my GPU. As of now, i have one EVGA GTX 560ti. I'm not sure if i should continue using my current set up, SLI, or just upgrade. If i were to upgrade, i would most likely buy a MSI GTX 680 Lighting Edition, but it seems that two 560ti's will out perform one 680 by just a little. I'm not too sure if i should wait for the new cards to release, SLI, or just upgrade now. Please leave your thoughts.