Room design - home theater

Hi all,

I am in the process of building an extension, 14 by 21 feet. I am deciding on the following ceilings..

1) Vaulted Ceiling, 8feet wall to 11feet center of the room
2) 9 feet Flat ceiling
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3) Cuffered ceiling with 8 feet on 4 sides and 9 feet center.

Please let me know if you have any inputs on differences between all these 3 ceilings in terms of music and home theater experience.

This room will be 80% music and 20% movies.

Thanks in advance.

Rodney