The Wrong Trousers was the first one I saw, but I've seen all 3 of those quite a few times now. They're almost always shown on TV during Christmas, and when they are I usually watch them.
I agree, they're still very good today! I haven't seen Curse of the Wererabbit so I don't know how that compares to the older movies, but I really like all the ones you've mentioned!
I'm not crazy; I'm sanely-challenged.