Hey there. I asked the same question yesterday

The other people responded with the Asus CUSL2 motherboard, for being VERY stable as well as overclocker friendly. I'm putting a Pentium 1Ghz in mine, but my friend has this board and it hasn't shown any flaws or problems. There are two versions of this board, but I'd recommend the original Asus CUSL2, and not the Asus CUSL2-C, for the C version has fewer USB ports, which I use many. Go to the Asus site and check these boards out.
Asus site