@dhite71 I have a NRG Custom Cables 4 outlet distribution box and attached cable. It is very well made and wasn't particularly expensive but I have no idea if it improved the sound quality since I didn't do any careful A/B testing. He isn't taking new orders until September.
Another small manufacturer is Ice Age and I did buy a loom of Ice Age OFC cables and after burning them in I can confidently say they are a significant improvement to the Pangea AC-9 cables they replaced.
I've never had any of the uber expensive power cables so I can't comment on them.