Congrats on the new projector! With video like that, a 5.1 system in a must. I'm sure you and your family will be very pleased with the projector. A good way to convince them that you need a 5.1 system would be to let them hear a proper setup.
Cheers,
Mike
P.S: I can't wait to see it (hint,hint)!
I live the life I love and I love the life I live.