ABit NF7-S v2
DFI Lanparty or Infinity series boards.
Hands down the best OC'ers boards.
If it's an OC'ers board, it's going to have an OC'ers BIOS with all the options you need.
ASUS is crap IMO, and their tech support is lowsy and most big OC's I've seen have come from ABit or DFI boards although some people swear by ASUS still. Their quality has dropped in recent years.
DFI Gives you Dimm voltage up to 3.3v and Chipset up to 1.9v whereas ABit goes to 2.9v dimm and 1.7v Chipset.
You won't need more than 2.9 dimm though unless you have winbond BH-5 type RAM chips, and if you don't know particularly what I'm talking about then chances are you infact wont need more than 2.9v
The chipset needs more voltage generally when trying to hit high FSBs.
Either go with DFI or choose an ABit and do a voltage mod to get that chipset higher if you wanted to.
I really wouldn't suggest the other boards that are listed here for your OC'ing needs.