The 7770 is a decent mid-range gaming card, for a gamer, you should prioritize the graphics card first, and then go for a good cpu second. Add in a small SSD for maximum speed, it's seriously the best upgrade. On the cpu front I'd wait for an announcement on what socket the new chips will be on, and decide then what to go for.
I'd also not ignore the lower end of intel's lineup. Those dual core celerons are as fast as the quad phenoms.
Intel i7-2600k with an XSPC Raystorm water block, 4x4GB Corsair Dominator, SLi Evga-GTX560Ti-448 FTWs, Asrock Extreme4 Gen3, Crucial M4 256GB SSD, Samsung Spinpoint F3 1TB HDD, powered by a Silverstone Strider+ 850 PSU in a Silverstone TJ-07BW case.
I'm not buying EK GPU blocks ever again. (One GPU killed)