Gigabyte GA-7IXE4, GA-7DX, or Gigabyte GA-7DXR. All boards are very stable amd platforms. Gigabyte is very popular with oems as they build very stable, high quality boards. They are also real strong benchmark performers, on par with asus. Avoid asus boards, as they don't yet support large hard drives (80+), not to mention all asus boards are beta-ware until at least their 4th bios update. If you are running a server, then skip the sound card or use integrated sound to insure maxium stability. Forget any intel celeron system; they are quite inferior to duron systems.
-- Chaos is the better order.