Is there an Escapist Tekkit server? Call me when there is, I'll join in a heartbeat.
But it really depends on the demographic. Every Pixar movie has a clear message, but not everyone will enjoy every message. For example: The Incredibles' message is about family. The 30 year old bachelor probably won't like it as much at the family of 5. Cars was basically, "Don't be a jerk. Because karma." Wall-E had the old environmentalism crap, and Toy Story had a "choose your own destiny" feel, but what separates those movies from the others is that their themes are not necessarily their message. Their adventures weren't with and end goal of learning something about themselves, but about the adventures themselves. It's a tough choice, but I guess I'd go with toy story, because of that ever-present feel of "I'm right here, but because of circumstances, I can't reach the goal I see before my eyes."
On the other hand, I do also love a story that brings a new and exciting world to life. Then I'd have to go for The Incredibles or Cars. Ughh, ok maybe it isn't as black and white as I thought.