IMHO: get the XFX HD-577A
-ZNFC model of the 5770. Not the "X" model.
It has the enclosed cooler shroud, to exhaust hot air out the back of the case.
Most cards use up 2 PCI slots, anyway, this one use 1 to force hot air out
of the case...
But be careful, not all advertisements have the correct pictures! A whole other thread!
(i.e. MicroCenter has both the egg-shaped
and enclosed shroud
coolers, but only has the picture of the egg-shaped. So check model numbers!)