I went from an old E6300 to a new E6300. I get 3.5 Ghz just bumping the FSB to the frequency Wolfdales all should run at and it is big improvement. + the old E6300 stock heat sink is really beefy; no need for new cooling.
On the other hand, I noticed that 965 boards (okay maybe just the recently departed Abit) aren't 100% copacetic with all the functions on the new Wolfies and 32 nm is just round the corner.
But yeah, Fry's has a E7500 with Mobo (It's a decent P43 too) for $100... if you can get to one. I've also noticed their too-good-to-be-true combos are limited to just a couple per store now.