There are lot's of choices, and most of them are backward compatible. The main sticking point is going to be the RAM. You currently have SDRAM if that's the board I'm thinking of. Most of the best boards currently available use DDR only. So, you might want to consider a more comprehensive upgrade. If you really want to upgrade just the board, and keep everything else, then something like the K7S5A would allow you to do so. It actually has both SDRAM and DDR slots, so you could potentially upgrade to a faster processor and DDR memory in the future. However, that board can be a bit flaky if the P/S isn't up to snuff. So, you might need an upgrade there too.