I use that rule with two exceptions (created by regret later at rigorously following the rule);

1. Tools - NEVER throw away a tool. If you used it once, you are likely to use it again.
2. Items with a replacement cost of over $500.

I was going to say something but the last time I commented on building/code the poster of that thread went into a terminal pout and refused to post any longer. I wanna see what neon you picked out, at minimum!

The best thing you can do to deaden sound going upstairs is to uncouple the physical connection between the ceiling and the floor joists. They make channels that you can attach to the joists and then attach the drywall to the channel. Anything you can do to break a "straight line" for sound or vibration to travel give huge benefits.

I'm happy for you... it looks like the perfect addition to your new space. It looks spectacular and there is a personal meaning to the sign. I'm guessing the neon guy will be getting some additional business from Pinsiders.

Awesome space!