Alot of it depends on what you want to do with it as well. My family has many sizes and shapes, depending on user and uses.
If you're just experimenting and the recipient is connected to the Amazon ecosystem, the Fire tables are a good value. The $114 7" Fire HD is a great size and runs lots of games and does Skype and is a favorite for parents/grandparents. The size is nice, not too big, the Mayday feature is nice if they need help. Can't go wrong for new tablet users. Of course, the higher priced Nexus Tab and iPads offer enhanced experiences with more memory and better processors but not all audiences need that.
FYI, they also have a new recent addition, a $99 6" tablet. I'm not familiar with it but my household has had most of their other offerings, including hte original Fire 7" and they've all performed well and Amazon support is amazing when there's been a problem.
Best of luck!
TMG