1. Monsters Inc
2. Wall-E
3. Toy Story
4. Finding Nemo
5. Cars
6. Toy Story 2
7. Up
8. A Bugs Life
9. Ratatouille
10. The Incredibles
I agree with the OP, but I haven't seen UP yet and I'd maybe swap TS and Neo.
Monsters Inc had a great story and the furr was pretty groundbreaking at the time IMO.
Wall-E is stunning and has a great story with a modern message, but nothing groundbreaking.
Toy Story kicked it off really and I've seen it about a million times thanks to my ex girlfriends neice and nephews.
Finding Nemo had an awesome story and visuals for me too, but I can't think whether it should go above Toy Story or not. Certainly my main favourite though.