KT133A...PC1600 isn't all that great, and PC2100 is to damn expensive.
Some nice PC133 2-2-2 and KT133A would be my choice.
When DDR becomes cheaper, I would definately favour AMD760+PC2100...
A possible interm solution would be PC1600 which isn't much more expensive than PC133...and then you could still use your board when you get PC2100....but personally I think I'll stick to PC133 for a while yet.