I would go for an Android Tablet not necessarily a costly one. Really you could use an android phone as well. I would suggest one with a larger screen touch preferably like HTC Evo, Dell Streak or others in that realm.
The price would be less half the cost of an ipad and you have a variety of apps that would work for you. You can also build you own app that suits your needs if your so inclined. There is a free app program I currently downloaded call grades and it has a to do list, profile, schedule, courses, etc.