Thinking of getting my wife this for a our 5th year anniversary, but I don't know much about it. I see they have the Ipad mini which is about 7.9" display while the normal size Ipad is 9.7" display. For you who have it, do you use up most of the space on it? They have 16, 32 or 64 GB? Or how do you use it and which would you recommend especially to take on vacation?