get a mac if you can afford it!
I have used a mac for nearly 20 years -- started with strictly business applications needs (exec level) and now edit 18 years of family video into iMovies, use iPhoto, etc. our son preferred PC (Dell) for his first laptop - came with me to apple store and ended up emptying his bank account to buy a MacBook Pro - used computer to do all kinds of school related video and power point presentations for projects - now thinks that "Macs rule!"
macs require some learning but they are soooooooooooo smooth!
check and see what on campus support is available for macs & pc's, get the best computer you can afford -- go to apple store to see what you'd be buying -- free printers and/or ipods available to college students -- also student pricing offered on office '08 for mac which is only software you will need to buy - GOOD LUCK!