Hands down in my opinion any of the DFI higher end boards. Check them out at newegg. And if you buy from newegg don't forget to click the newegg banner at the top of the website first so Dave gets a kickback.
The DFI LANParty UT nF3-250Gb has been called an overclockers dream. If you can afford it and your serious about your OC's, then this is the board for you.