Hey gang, just looking for some advice concerning a purchase I'm about to make. Currently I'm using an older HP 25.5" TN display with native res of 1920x1200 and 1 MSI GTX 570 Twin Frozr II running at a comfortable 802 core/2050 mem OC, but I'm just about to replace my monitor with the Yamakasi Catleap 27" LED IPS panel with a native res of 2560x1440.

At present I'm perfectly fine with my framerates in the games I play; Skyrim with ENB and lots of graphics mods, Diablo 3, TERA, etc. But when a jump to a panel with 2560x1440, I'm anticipating that my single GTX 570 might start to struggle. That said, I'm wondering if adding a second GTX 570 and going SLI would address this issue, or if I'd be better off getting a different card altogether. Thoughts?