If you want a SD Ram board that you can upgrade later to DDR, i'd suggest the ECS K7S5A. It is a very fast board for the price. You may have a couple of troubles when installing it, such as no video, where you will need to reseat the AGP card a couple of times (this is a common thing with these boards), but when it is up and running it is very fast.
It doesn't have any overclocking options from stock, but you can get an overclocking BIOS if that is what you want, which will give you some more FSB options.
It has ATA100, so more than ATA66, onboard sound (which can be disabled if you already have another sound card) and also on some models it also has onboard LAN (mine doesn't, but i got it in the UK, most US ones do).
For the price, you can't really beat the K7S5A. It is still one of the best selling boards, and it's performance is somewhere between i believe the KT266 and the KT266A
ConfusedBW