This seems like a great deal! I really want to upgrade for under $1200. I have a Dell XPS 420 (Q6600) and nVidia GTX 670 now. I play games and do HD video encoding. I understand this model doesn't support OC'ing, but will it support SLI? Is anything special on the horizon in the next 6 months that I should hold off for (Windows 8.1), or should I jump on this deal?