Well, if you are going to a KT333 chipset board, I can highly recommend the SOYO Dragon Ultra. This has been the easiest motherboard setup and tweak of any board I have ever owned. Everything worked perfectly right out of the box, everything loaded correctly the first time and I had zero hardware, IRQ, port, etc glitches or problems. It's pricer than some other boards, but well worth the money (I got mine for $145). Also, the onboard peripherals work very well. It has the built in CM 6 channel audio that I think is every bit as good as my SB Audigy (it even has EAX), the onboard Real Tek 10/100 LAN works just fine. The onboard High Point IDE RAID is very nice also. I have a pair of 40GB Maxtor drives on RAID 0 (striped) and the disk performance is noticeably faster. The Sigma box that comes with the mobo (adds four USB 2.0 ports into a 5.25" drive slot on your case) is an outstanding feature. You still have your other USB ports on the back as well.
Anyone that's been building systems for any amount of time knows that VIA has had some chipset problems in the past, especially the KT266. The KT266a fixed a lot of things and was a good performer, but their new KT333 absolutely kicks ass.