Well, i play RPGs, strategies, adventure games, and occasionally FPS. Not really specific about a genere, I know.
As for the design, yes I agree, quad would certainly be best option. However, are you certain that some i7 wouldn't be much of a improvement over i5 760? If its about the money, I sure am willing to invest into something that will last. Unless ofcourse its only a minor improvement, or if an overclocked i5 would turn out better then overclocked i7.