LOL, I understand! We actually wired some of the rooms for speakers and believe it or not, actually planned to put speakers in the corners of the room, in the top of each four corner INSTEAD of mounting them in the attic above the main floor and having them FLUSH with the ceiling. DUH! We ran all of our internet wiring too and of course most everything is wireless but I will say that having the ethernet able to connect directly if needed is awesome. In our house, the modem is SO far from my theatre room that I couldn't get a good signal so I had to have my audio/video guy wire it directly to the internet because that was one place we didn't wire the internet to.....never thought about finished the area over the 3 car garage into a theatre room, but that was what we did!
I cannot imagine having to run that wiring thru the (finished) basement ceiling!!! You've got your work cut out for you but it will be so nice when you finish! AND then you'll have your new Tesla! Win-Win!!