Well, DDR memory (the PC1600) isn't too much more than SDRAM right now, so you're only gonna be paying significantly more for the mobo. Personally I'd say to go ahead and do it since it should give your a very small performance advantage now (albeit slight), but if you want to upgrade to a faster chip in the future (a motherboard usually carries me through 2 or 3 processors) then it would help a lot more then. If you're pressed for cash though I would say it won't make much difference at the moment.