The Asus card allows for voltage increase for overclocking. To be honest all 3 are top notch. I have an EVGA EE model ordered myself as the reviews I have seen show it works to keep heat out of the case but it's fan is a bit louder than the others. Also I have had 5 EVGA cards in a row and have loved them all.
I really love that the lifetime warranty covers things like me applying aftermarket thermal compound and overclocking/overvolting...... also the 90 day step up is great.http://www.overclock.net/nvidia/792717-evga-gtx-460-superclocked-1gb-edition.html