Here is a quick list of things your computer will need to do at Scholl:
-Lecture videos (Some lectures are recorded in video format/audio format)
-PowerPoint (For class notes/presentations)
-Word Processing (For group projects/papers)
-PDF viewing (Some class notes are in this format)
-PDF editing (If you want to make notes in the margins on the computer)
-Flash/quicktime (Pathoma review videos/USMLE reviews for part 1/Flash games for boredom)
-VLC player (Free downloadable video/audio player which allows you to easily double the video speed to hasten lecture videos)
-Spotify/Pandora (You will need music)
-Firefox/chrome (These browsers are much more secure and much faster)
All of these tasks can be accomplished on most PC/MAC machines. The ipad family may be a little underpowered to handle all the tasks and they tend to only last about 3 years because like any apple product the mandatory software updates render it as an expensive paper weight. The Microsoft surface luckily avoids this. The main thing is to get a computer with plenty of RAM and a large hard drive. The RAM will all you to run music, powerpoint, word, a PDF, 10 webpages, and a flash game without crashing (this is what everyone should be worried about).
Edit: I don't mean to bash on the ipad, they are great. They just function better as an adjunct to an actual computer. The Surface functions as a normal computer and avoids the pitfalls.