I have an iPaq 2215. It has a CF and an SD slot, and I have a 512mb card in each.
It does everything I need it to do, from Nevo (the 2215 has an IR sender so it can act like a remote, fun for those long stays in a doctors' office, and killing TVs in stores that have them up way too fucking loud for advertising...
) to a personal task manager, to an mp3/wma/wmv/mpg player. I don't need gigs and gigs of space for my media files, so a 1 gig total is enough for me.