I loved 13. It was a refreshing turn in the series, but I can see why people didn't like it. I'd like SE to develop an FF title that takes place in much older times. Something that doesn't come off feeling cold, dim, and in the distant future. Perhaps something with a little more heart.

The game, characters, and setting that comes to mind is Final Fantasy 9. I know it's often overlooked, but it's my personal favorite out of the main series and I'd love for them to catch that kind of magic in their next title.