I have found lots of apps which give me total disk file useage and iTunes breaks it down by major categories of file, eg music apps, video, but what I really want to know is how much is taken up by individual apps and their data. How much space will I save if I delete a particular app and its data? I can't find anyway of finding out. As I am about to upgrade my iPad do I just keep buying the largest or can I cut back and buy something smaller? Most frustrating.