With the Radeon HD 7770 at $120, Radeon HD 7790 at $150, and Radeon HD 7850 above $180, Nvidia is rendering all three products ineffectual at their respective price points. With one swift stroke, the company engineered a hostile takeover of the $100-$200 market, increasing graphics performance at any given budget in that space.
As you can see here...the "performance per dollar" of the 7770 is only 86% of the 650 ti Boost .... however if the games offered to sweeten the deal on the 7770 are of more interest than the $75 game coupon on nVidia's bundle, that may sway ya thoughts in this regard
Funny cause that link shows that the HD 7850 is faster than 650ti boost in 3/5 of the games tested and also does it with tighter frame times. Then the reviewer contradicts himself at the conclusion LOL.