If you're looking for the cheapest solution, go with a motherboard that has a VIA KT133 chipset and get a 1.4 GHz Athlon (wait until the Palominos arrive in September to get the 1.4 GHz Athlon). Despite VIA's rep, this chipset has matured well, and works just fine under Win2K (I run 2K with this chipset on an MSI motherboard).
Even though I can somewhat notice that my AMD 760 chipset is more stable than the KT133, it's nothing to get excited about. If you're looking for the cheapest solution (and one that is reasonably fast and reliable) a KT133 will fit the bill.
For a little more money, I would also look into the SiS 735 chipset, since I heard it's just as reliable as the AMD 760 chipsets but cheaper. The SiS 735 supports DDR memory, which makes it look even more attractive because you need these computers to last around 5 years. Therefore, look around for cheap motherboards with a SiS 735 chipset.
RAM prices are very low, DDR costs basically the same as PC-133 at Crucial. This fact makes it more tempting to get a DDR board. You will get a cheaper price with the VIA chipset, but it only supports PC-133 memory.
I haven?t heard of any problems with the SiS 735 under 2K. Where did you hear this?
Edit: I just found a review for the MSI K735 Pro Motherboard Review. Here's the
link