I second 3, though I've enjoyed them all (and really did love the last two). For two reasons, mostly. First, while not my favorite book in the series, that was when I really started liking them (don't care much for the first two). Second, it's absolutely beautiful, and very storybook-like. It took on character as a film, whereas the first two were definitely just adapting the source. The whimsical transition shots with the whomping willow are a good example of what I mean. I could compare it to the tv show Pushing Daisies (one of my favorites in years).