Followup - the GTX760 DirectCU II is seeing some holiday discountage; I'm actually seeing it at MicroCenter for basically the same price as the GTX660 (finally). With GTX660s in shrinking supply, the thought of a GTX760 in 660 price turf (and power turf - the DCU II takes a single 8-pin/6+2 power plug) is definitely attractive.
The 760 is spec'd for 170W, whereas the 660 is spec'd for 140W.