I'm seeing the performance in this recent article as basically identical:http://www.techpowerup.com/reviews/EVGA/GTX_650_Ti_SSC/11.html
The GTX 660 is actually about $20 cheaper after rebates, but the 7870 comes with two free games. There are no 7870 LE models available, and they would be $40-$60 more expensive than the 660. I think I would go for the 7870 IceQ you listed for a nice quiet experience and the two free games. If cost is all that matters, you won't lose anything by getting the GTX 660.