I just got the Dell XPS 12.1 inch widescreen. Small, but not so tiny it is hard to read/use. It's also very lightweight. Good machine.
Looked at the Macs for a brief moment. Just too expensive for what you get. They also aren't designed to use the Intel processors to the fullest. I would also NOT get a Mac for college. Working at colleges I know most the software out there is designed for PC and not Mac. We had both, but the support out there was almost always PC based.
Don't just get cheap though. You get what you pay for. A $800 laptop will not hold up as well or last as well as a $1500 one. You aren't just paying for speed, you are paying for the quality of the components inside.
I love the XPS line, and the Latitude line (small business part of Dell) is a good one as well. That's the line my DH's company uses exclusively at work.