Anyone know anything about Tablet PCs?

I've been thinking for a while I need to get a graphics tablet/laptop PC and I've been shopping around a bit and found that graphics tablets are insanely expensive and that isn't gonna change much.

However I figured if I wanted to take the plunge and get a Tablet PC that I'd want to get it from a highstreet dealer (god forbid - PC World) just so I know where I stand with it if it goes wrong cause I don't know much about laptop repairs and would just want to throw it off to someone else.

Any of you guys got any experience with Tablet PCs? Any suggestions on where the best buys may be?