I don't know what you are planning on studying, but I know some places recommend/require having a Unix-based operating system if you are studying computer science. In that case, you could either get a laptop which you could install some sort of Unix OS on, or you could just get a Mac if you prefer not to install your own OS but want a Unix-based system. On the other hand, I've heard that most CAD programs do not work on Unix, so if you'll be doing mechanical engineering in particular, that is something you may want to consider. Probably your best bet is to do some looking on the college's website to see what they recommend. Often colleges offer discounted hardware to students.