I agree with everyone about the credits being appropriate for the seasons they were used. The first one is fun and energetic, but I miss seeing the characters we know and love in it. So, I have to go with the season 4-5 opener as my favorite. I like the song, and I love seeing the characters and the messages (the positive and negative couple, the t-shirt images, the grooms holding hands). I love how it combines the characters themselves with some of the themes and messages from the show.