Best valued CPU now, considering OC potential

What do you think is the best value right now if the user's goal is to achieve the best overall performance at the lowest price?
Overclocking potential should be considered (and by that, I mean it should be considered what average people can get on air with a decent aftermarket cooler.) Assuming ddr2 800 memory.

e4300 for $114.50--> It seems that the average overclock on these chips is somewhat lower than 3.0Ghz. I'm not sure if most people can get higher but choose not to, or if the majority of the chips will only reach that level while a few will reach much higher.

e4400 for $139 --> I haven't read much about this chip

E6300/6320 for $166--> I'm not sure how high these will go. Maybe 3.2Ghz?

E6400/6420 for $188?

E6600 for $225? --> Top end here seems to be 3.6Ghz. Most people seem to end up with less than that, at around 3.2.

So, what do you all think. If people are consistently able to get 3.0 Ghz on the e4300 while only getting 3.2 Ghz on the E6600, it is not much of a decision. Clearly the e4300.


But, given what is available today, and what the average overclocker can expect to achieve on air (again, talking averages, not those special few chips that will reach 3.8 or whatever on air), what is the best value?

Thanks