660 ti is around 200$, 760 around 250$, 770 around 330$.
And I stand by my decision of the options given. Some countries the 770 is off the charts expensive and it may be out of the question. I don't argue the point that a 770 and i3 will be fastest, but that wasn't the question. The 770 is a 680 overclocked, and considerably faster than the other cards
The 660 ti +i5 is a better overall - you won't run into CPU related overclocks and have a MUCH better "future proof" scenario with the faster CPU you can just upgrade the GPU at a later date.