Best Set-up/Demonstration CD

Which is the best set-up/demonstration CD? There are quite a few out there. Is one particularly useful for speaker placement/adjusting/evaluating a system? Is there one that can really show off what your system is capable of?
You will find out quicker if you use the search function :)
Thanks, Ketchup. I got a some information that way. Not really comparing them, but at least something.