I did something a little different than most others here. Because of the way my computer purchases broke down going into law school, I had only a netbook for computing the summer before school. I decided to build a desktop in addition to it. For a total of $800, I have a super lightweight, 4-6 hour battery life (after a year of use) netbook to take notes on and have for school, and then have a nice desktop to do heavy duty computing and multitasking with at home.
I am really happy with my decision. I can deal with the small screen and keyboard of a netbook, however, and didn't find it to limit my typing/exam taking. If anything, the slow processors and the like probably helped me by keeping me more focused in class. I don't screw around and play flash games or sporcle during class, because the little guy can't multitask too much.
Also: another one for dropbox. And my referral link.http://db.tt/ipDDGto