May I recommend an alternative? Take a look at tabletpc's. They allow you to write on the screen. You want to get the kind with a fancy pen because they write so much better and have a built-in eraser. I love mine because I can (and do) use it as a notepad. The notepad thing is great, especially in classes where it's pretty much impossible to take notes with a laptop. I've also used mine to draw organisms in bio lab.
I scan all my textbooks in so I never ever have to lug them around, but this allows me to write and highlight my books too, and I sell my books for pretty much what I paid since they're perfect.
Mine is a convertible tablet, which means I can flip the screen up and use my computer like a normal laptop so I can quickly types notes in classes like history and econ. There are some tablets without keyboards if you want less weight and bulk.
They are a little more expensive, but mine has already paid for itself by allowing me to lose less money on books. Even if it didn't pay for itself, I'd still want one so I wouldn't have to carry around textbooks.
Anyway, if you have any interest, just pm or email me. I don't sell them or make any money off of them, but I'm such a big advocate of them that I'll be more than happy to spend some time helping you find the perfect tablet at a great price.