where you'll find a selection of machines. It's a god idea not to go too basic with a university student's laptop - apart from coursework it will probably have to cope with music/video files, and heavy internet use.
Don't buy a machine that has less than 1 gigabyte of RAM, and go for more if you can - the new computer will almost certainly have Vista installed, and that can make some serious demands on resources.
You'll be swamped with choice, this is the age of the laptop, and all new machines will have wireless networking built in.
I advise that you buy a security device as well - one of those wire cable things that lock into a special holder on the computer and secure it to a nearby radiator or something. Laptops and halls of residence = opportunities for theft.