I'm building a new computer and am going to use the i5 2500k. Now I plan to SLI/Crossfire in about two months from when I build my computer which is in about a week. Is there a GPU that won't be a bottleneck with that CPU? It also needs to have a low enough watt usage so that when I SLI/Crossfire the wattage can stay under 650w. My PSU is an XFX XXX edition 650w. Also I want the GPU to be able to max out 1920x1080, possibly 1930x1200.