Teddy Pardo makes outstanding power supplies. There are many threads about streaming that state the cost of high quality sound comes at a price of $2000+ . If that's true, then the Node upgrade makes sense. I'm undecided.
I've made a significant upgrade in SQ with my Node2i by adding a Cullen C7 power cord and using CAT8 ethernet from the router. Pretty inexpensive for the increased performance.