Well, I just researched that calcuscribe thingy and, while I've not seen one in the flesh, by what I found on the web I wouldn't take one riding with me in a million years. Clearly targeted for growing kids and almost as big as a small notebook pc. My advice is that you research the currnet line of PDA-handheld computers and find something in your price range. There is a folding keyboard for many of them (forgot the brand) that is awesome, just as good as a laptop one in size and feel. Granted, you don't get a full-size screen, but their screens are now very good. Take a look at compaq's iPaq and you'll be convinced (or not - big $$$).
Other than that, if you want a laptop-like keyboard and a laptop-like screen... get a laptop. A small, not so young, cheap machine will do on the road as long as it gets good battery life. I would go the iPaq way, though. Amazing capabilities there.
Just my thoughts, your mileage may vary.