Shape of home theater room?

i have a basement in my house that i'm thinking of converting into a home theater. What shape should i make the room to be to gain the best possible sound quality? The basemant is now rectangular in shape 32 ft x 20 ft.

Any recommendations.

thank you
Here is one recent thread that is probably worth your time. Also Everest's Book on listening room acoustics is very readable and informative.

Rives and Art Ludwig's site

I remain,
I wouldn't even consider changing the dimensions of it.