I am running 2 22" 1680x1050 and the retina display. One via minidisplay to dvi and the other hmi to dvi. The 15" + 750M gets uncomfortably hot near the Fkeys. Makes me uneasy going clamshell as the heat could burn the retina screen.... Would a thunderbolt display run cooler? How about 2 thunderbolts daisy chained to the same thunderbolt port? Also, wondering if the iGPU version would run much cooler running 2 displays without losing performance?