Congrats on the new home purchase. Does this mean a new sound system too? I won't attempt to provide any electronic setup advice as your knowledge in this area is way beyond mine, but I will add a couple of points for the gyproc walls and ceilings. I did not hear anything mentioned about "resilient channel". It helps to keep sound in. The rest of the household may like that idea at 2am. It also makes up for uneven floor joist and wall studding. It is normally 1/2" thick so does not take away from the room height or wall space. I would prefer to have a drop ceiling as it allows quick access for updates or problem solving the mechanicals. Maybe not for this house but on your next one is using longer span floor joists to eliminate the dreaded floor beam support posts. Warren truss floor joist are perfect for that or larger JSI's.
Good luck on the project,
Troy
