ECS K7S5A

Have one running a 1.2Duron and no issues. Board can easily overclock your chip and has some nice features.

4Dimm slots 2 for PC133 and 2 for DDR
5PCI
Onboard sound and LAN

Should be had for around $50

They sell this board and 1.7+ XP's for $119-$129 at my local Frys when they go on special.