We have both Macs and Windows machines on campus, and both are highly supported. This is more of a question of personal preference. Most students on campus do not take full advantage of the portability that laptops offer. They generally leave their computers in their rooms instead of taking them to class. Computer labs are readily available in almost every building on campus, so students have access to a computer wherever they are.
Laptops are more expensive and more prone to theft and damage than desktops.
Again, this is a personal preference, but the benefits and costs need to be seriously considered. If you are living on campus, you do not need a modem in your computer. The ethernet card facilitates your connection to the Internet. Ethernet cards are available in the Book Mark. The Department of Information Technology supports a variety of Internet and productivity software packages.