My setup is a I7-3770K and a GTX 780, so pretty similar to yours. I also run at windowed full-screen at 1920x1080 with two monitors plugged in at all time. All settings are maxed as high as possible (ultra shadows, SSAO high etc), and I am sitting at a steady 60 FPS even in 25-man raids (This is if I only have WoW open and unplug my second monitor).
Edit: Just reinstalled my driver yesterday btw, and I am seeing no difference in WoW.