Here’s another suggestion. Go for an Ultra Mobile PC (UMPC).
Samsung Q1 Ultra is a little tablet PC with a thumb-board if you like to use the Blackberry type pads. Or you can use its handwriting recognition software that comes with it (that technology has come a looooooong way) or when you’re home you can hook up a USB keyboard and its like a regular computer. It fits in the smallest of places and is very portable.