The Passion Origami series (available at
http://www.origami-shop.com) include a range of wonderful models with books by Quentin Trollip,Roman Diaz, Nicolas Terry and two author collectives (that is including the VOG book to be published).
I've got Jeremy Shafer's first book, "Origami to Astonish and Amuse" and that is worth owning just for the writing style as well as containing some very unusual topics for models.
As you are fond of John Montroll (and I personally think he is often undervalued), I would add "Origami Sculpture" to your collection.
And then of course, for theory as well as a range of models, the second edition of "Origami Design Secrets" by Robert J. Lang is about to come out.
http://www.giladorigami.com is a great website for checking out the contents of books.