How big and where to put a Home Theater

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Today was our first time looking at some new houses as a potential new home here in eastern Pennsylvania. Boy am I tired. We have yet to decide specifically where to move or whether to buy a used house or to build a new one. My main requirement for the house is to have an adequate space for my new home theater. But, I am not sure as to what size (dimensions) that I really should have for the large speakers, components, anticipated screen and projector. I hope to have 2 rows of seats and possibly 3. You can see a list of much of my present equipment including my Pioneer Elite TV that I intend to use in the theater as well as the projector below in my signature.

Some of the questions come down to having the theater on the main floor or finish a basement for this purpose, dimensions as already mentioned, and what is sufficient for the ceiling height- 8', 9', or 10'

I would appreciate any comments and suggestions that would be helpful and much appreciated. I hope to move later this year perhaps in the next 3 to 8 months.

Rich