If you want a Desktop replacement, check out the HP zd8000. I actually have the previous model the zd7000, and if you are looking for a lot of power in a semi portable package, this is the way to go. I am not sure about lugging it to class, but if you want to go to the library or down to the lounge, to get some work done, you can. It also has a numeric keypad, which if you have alot of numbers to punch it, is great.
http://www.shopping.hp.com/webapp/sh...computer_store