If you're looking for a great low-cost Mobo, the SIS chipsets are awesome. They are only a tiny fraction slower than the fastest - VIA KT266A - and cost far less. I got my K7S5A for $50 and have it OC'ed. I saved over $100 and couldn't ask for a more stable, fast system.
If you are looking for USB 2.0 or UDMA133, you'll need to look elsewhere or spend a little extra on a PCI card. Then again, if you need these things, you shouldn't buy the SIS based board.
I thought a thought, but the thought I thought wasn't the thought I thought I had thought.