I just replaced my primary desktop with a 17" laptop which I picked up for about $1800. It doesn't travel frequently with me (I've got a work laptop for that) but I love it and wouldn't go back to another desktop.

Regarding the original question -- I'd look at one of the small laptops (e.g. the Sony Vaio) if portability is an issue, but a PocketPC isn't a viable alternative yet.