Building a new box (finally), but I'm keeping XP Pro on it.

I know XP can't use a full 4GB of RAM, should I bother getting it. (Mobo only has 2 slots, so my options are 2 and 3.) Probably won't game that much on it, but Flex, Flash, CF Developer, iTunes all get RAM hungry after awhile.

Thoughts?

Also, if anyone wants to point out modules that work fine with a Shuttle SG33G5, feel free. Couldn't find anything from a reliable company on the support list.