For the Dream Chip with a fV of 36V and driven at 7A, the max power would be 252W.
I wouldn't drive it anywhere near 252W. Nominal power would be 3.5A at 36V = 126W. That would be about where I'd drive it most of the time. 126W. I wouldn't drive it over 1.5X 126W, but thats just me.
This would be good enough for most users:
http://www.arctic.ac/en/p/cooling/vg...us.html?c=2182
Again really slick looking and a low small profile. I was thinking of creating a bracket to mount this cooler to a Kessil Gooseneck for my Dream Chips, but I'll make one for AC-RC's solution too.
Ron