Appreciate the advice. Incremental changes sound like a sound path forward. Since I got a nice bump recently with my N200 I'll wait a couple months and then start experimenting with ethernet and power. Will definitely give the ENO a try and report back...may be a few months before that happens but it's on my list now.
So far in my limited experience I'd agree that everything matters. Some things are pretty easy to understand...gear upgrades, speaker cables, interconnects...while others take more of a leap of faith. I still haven't taken the leap when it comes to things outside the signal path (power cords, fuses, etc...). But perhaps at some point I will...