Building a new house. Home theater with surrond, etc. in a space 12' x 14'. Open design, total living and dining area is 24' 14' (open space) with ceiling that goes from 8' to 15' over the 14' dim.

40" LCD TV on wall next to fireplace. Ceiling height at TV is about 10' but ceiling is climbing right to left up to 15'. No good place for floor mounted speakers, wondering if ceiling speakers could be a solution for right and left stereo speakers and how far apart? Center speaker can go under the TV and there is shelf space nearby to the right of TV for a sub. Also, can I consider ceiling speakers for rear speakers as well?

I have a sketch but can't seem to attach here.

Thanks for any help here.