Agree with bearclaw.
I bought the same chip with a V Pro board and a Phanteks PHTC14PE cooler. Haven't put it together yet (been busy, will do it over the weekend), but my expectations are not super-high for overclocking.
4.4 - 4.5 Ghz seems to be the reasonable range right now, and you should keep in mind that temperature is not the only limitation. Even with safe temperatures, pushing the 4.7 - 4.8 Ghz range, people are running into voltage and stability issues.