Best DVD edition

I have the Optimum classic edition (R2), but I was considering to swop it for a better one. I know the American release contains some interviews with John Karlen and Andrea Rau where they talk about their relationship with Delphine. Are they interesting? I also seem to remember that there's a version where Delphine sings a song during the opening credits, but I believe it's been issued on VHS only. Am I right?