For taking notes in class, get a bluetooth keyboard. There was an iGo ThinkOutside unit at Amazon for $30 recently. Or the Apple bluetooth keyboard (doesn't fold but is a better keyboard) works as well.

I would get SD cards. Check an earlier thread in this forum for discussion of a deal that was going on at Newegg and may still be available. Unless you need a small keyboard with you at all times AND a GPS, I'd look at the N800. The other possible reason for the 810 is reports the screen is more visible in direct sunlight. Not a big problem if classes are indoors.

The macbook will give you a high-end platform when you need applications that everyone else uses. The N800 or 810 will give you portabilty.