If you love Muppets and appreciate Jim Henson on any level, you need to get this book. It details all projects that Jim was associated with whether creatively or otherwise, and even includes a small booklet about his youth. It isn't a book necessarily about Jim as much as it is about his projects and how he affected the entertainment industry. I love this book, it has TONS of great photos.
But where are you finding it for $50? It is now available in paperback and should be cheaper. Check out your local bookstore for it.