Remember we only got the 2GB cards, so it's not $150-170, it's just $170 for now. Of course, as my conclusion said,

In this market segment, money talks. The GTX 650 Ti BOOST is listed as having a (reference) MSRP of $169. That’s $20 more than the HD 7790′s $149, or 13%. However, that 13% price premium translates to 17-31% FPS increase, depending on the game. AvP, Batman, CivV & Dirt 3 come in at 27-31% higher FPS. That’s nothing to sneeze at. In fact, those games increase double FPS per dollar over the HD 7790.
I know these are lower end cards, but even though it's stressful getting two NDA cards at once and both have ~3 days to review, it is FUN being on the front lines of this kind of battle.