A touch late to the party, but I'll also suggest the MacBook. I got one for school - absolutely brilliant. The upgrade to 1GB of RAM is definately worth it, though. I've had a fair number of crashes though... seems like if I put it to sleep (by closing it) without allowing sufficient time for everything to get in order, it needs a hard reset.
Still, leaps and bounds ahead of any Windows machine (imo). And can run Windows, if you're so inclined.