I was going to recommend an MSI K7T Turbo Limited Edition because I am pretty sure it's not affected with the defective parts that the Pro2's and 2A's are affected with.. but you probably won't want another MSI now.. for me, that mobo has been running no less than perfect in my 2nd PC (was in my main rig up until about a month ago) .. total flawless and fast operation.. excellent product IMO... and like i said, they are suppose to not be affected like the other models. They are also a very low price, and have a red PCB which looks cool.. it's a perfect budget mobo, and what I would buy if i was building an SDRAM Athlon / Duron rig.
might as well suggest the K7S5A just because it's cheaper than dirt cheap.. I don't really have full faith in it's reliability, as it is afterall the cheapest mobo you can get ... but they are alright when tweaked properly.. for $50 it's hard to go wrong unless the board is really flaked out.. heh