The Lion King was wonderful!
I love how they based the story off of Hamlet and you really get a sense of tragedy in that scene where Mufasa dies... Always brings a tear to this sea otter's eye
As for something more recent, I really love Fantastic Mr. Fox. I loved the world, the characters, and the use of stop motion. At first it looks a bit jerky, but if you watch the extras on the dvd you can see how much love and time went into building the sets and models.