Haha, that's funny - The Prisoner of Azkaban is actually one of my favorite HP books/movies, while the Goblet of Fire is one of my least favorites. I'm actually curious about what you'll think about the fifth one, since it's my second favorite book, but I really dislike the movie version, as they changed and/or deleted all of my favorite parts haha.
By the way, how many chapters are you planning for Bermuda Triangle? I'm pretty sure you told it, but I can't remember - sorry!