I think the E7x00 series are the best when it comes to performance/$.
I would not buy the E7500 for 140$ when I can get the E7400 for 120 and overclock it the way I want. You can get ARCTIC COOLING MX-2 Thermal Compound for 7$, apply it instead of the stock one that comes with Intel's HSF, and that will be more than enough for a 3.2-3.5 Ghz overclock.