Apple i hear is good with video editing, art works, ect.. but it's entirely up to you. Does your school recommend Apple or PC? If it doesn't matter with them, i would stick with a PC as you are already familiar with Windows. If you have never used an Apple PC you're going to have to learn how to use the OS & most likely you'll want a reliable system that you know a bit under the hood in case of a problem.
If i was in your position i would get a PC. As for brands i've stuck with HP/Compaq.