I've always wanted a tablet that doubled as a notebook, I've heard good things about the WACOM iPad stylus, but I've never been able to test it myself. They aren't that expensive (About 30-40 bucks depending on where you order them from) but they appear to be a bit thick on the drawing end, and they look a little awkward to hold.

http://wacom.com/en/Products/Bamboo/BambooStylus.aspx