Hopefully BoomieMCT will see this and chime in. I steal his "Cookbook" all the time when I want to reference it
I think he has the most recent one. There is a lot of good information in there, but you are right, $24 is a lot when you can get 90% of what you need for $11.
Cabinet diffraction and voicing are very important issues, though. Tough call. It will be more expensive if you end up buying it twice to get the extra chapters -- so that's what I would do.
Good luck.