Second the speakers, and I'll suggest ethernet. I put ceiling speakers in my garage a month ago, wired to a small amp I screwed to the rafters and plugged in to the garage door opener outlet. The phone has music playing before the car is all the way up the driveway.
Also, 50" is fine, but I also have 3 outlets 4 inches from the ceiling. When I'm working on a big project in the middle, extension cords get plugged in up there and run on a hook or two in the ceiling to drop in the middle. Sander or router and shop vac, or under hood light, etc. No cord to trip over.
Also nice if you might put a TV out there.