BEST Skyscape apps for nursing school

I am looking into getting an iTouch for nursing school. What is the best application to get for it? Does the nursing constellation plus packages seem to have all you need on them for school, or do you seem to need to buy additioanl applications with it? Has anyone compared the nursing constellation and the plus package? Any advice on what would be best for a 12 month accelerated nursing program would be appreciated!

Thanks!