If it helps I think you can buy up to 6 (could be 4) of the 2004 Passporters now for just the cost of shipping and handling. Check the website. You could always give extra copies to give to the kids to use as their own planners.
You can always check the Passporter website and other sites for updates anyway if you're happy with the 2004 one and just want info on new rides, park hours, etc.
I have a spiral 2004 that has helped me with planning for our Xmas trip this year and I like it. It's got just enough pockets and blank pages for notes. The book comes with some stickers to help highlight things, but I ended up getting a highlighter ad some (Hello Kitty) post-it flags to mark it up. The elastic strap to close the book is a great feature also.
I wanted the Deluxe version but figured I'd use one Passporter per year and it would be easier to keep all the stuff together by popping one "completed" spiral bound book on the shelf scrapbook-style. I think if I had a Deluxe version I would put too much stuff in it and for me the point of the passporter is to keep only what you need where you need it.