You did not mention Keys to the Kingdom, but that's our favorite. Saw some awesome things on that one. Behind the Seeds is great for a low-dollar, low-time investment. The boat ride through the Land is so fast, it's hard to absorb everything, and the tour allows you to do that.
We did the Segway in October, and enjoyed it very much. It's fun to go back to work on Monday morning and be able to say you've ridden one.
Overall you've got some good choices, just depends on your personal interests.