What do you need to do with it? Do you just need to be able to write up reports for classes and have internet access, or are there special applications you need to use for your classes? That might change the recommendations.
Otherwise, I agree with Russ, when it comes to Mac vs PC for student uses, it's usually better to just get whatever is predominantly used on campus so you know you'll have no compatibility problems. Check with your IT help desk and see if they support both platforms or prefer one over the other.
Once the essentials are covered, since you'll be lugging it around all day as a student, I'd look at the weights of the different models that meet your other criteria and get the lightest weight one you can afford (there's usually a trade-off in weight vs. price).