yes, definitely the 8800GTS G92 was the best card for price/performance back in the 8000 series.
EVGA cards are usually a bit more expensive because of their step up program, you could prolly find some other brands that go for less.
as far as i know, OC-ing your CPU to a higher clock speed will give you dramatically better performance compared to you just OC-ing the vid. card and leaving the CPU alone. OC-ing a vid. card is a little bit more hard than a CPU, as you have to deal with artifacts and changing the card's video BIOS and such if you were to really want a good OC out of it. and then the heat issue and noise issue, because usually people either turn their fans really high with RivaTuner or they go for a water cooling system.
there are programs that gives you minor OC's, but nothing dramatic where you would see desirable increase in FPS.
that is why CPU's such as the E8400/8500 are so great for gaming, their clock speed are so insanely high.
but looks like we've found your card