It would be useful to inquire regarding what computer operating systems are supported by your college campus's IT department. If they don't support Macintosh, then your decision has already been made for you.
If you already have a Windows desktop computer running Windows-XP and have purchased good application software with which you're happy and comfortable you may find that many of those licenses will allow you to install it on a second computer. Notebook computers are still available with Windows-XP pre-installed.
If you make the transition to a Macintosh notebook computer you'll need to buy all new software to handle applications that are not included with the Mac OS. Outside college campuses about 90% of the business world is using Windows. There are some business Websites and many applications that do not support the Macintosh operating system. If you can accept that you may, at times, be isolated with your files and applications because you've chosen an operating system that is not used by most businesses and you can get Mac support on the campus the learning curve to make the transition from one operating system to the other is no big deal.
What do the color stripes mean on your tires?
Brian Cooley tells you why you might see various color lines on the wheels of your automobile.