Primary tip for budget
- Isotek Syncro Uni and Isotek Sirius (if both are used, budget will include decent power cables)
Secondary tip for budget
- Audioquest Niagara 1000 or 1200
The Isotek Syncro Uni will give glimpses of serious high end, as it provides a better way of taking care of DC and incorrect sinus than most DC-blocking devices (less jitter and distortion is left, compared to Supra Jennings DC blockers and a likes). It’s worth twice the price and has nothing to do with dc-problems (even if it solves dc-issues), it’s a way of getting late night listening experience daytime, and getting more emotion, detail and better low level listening.
Niagara is the all in one solution, but it is not the end game. It can take a part of the soul out of the music (more thin sound). It’s good though. Syncro Uni will be in use in the long run even if you get a P20 (makes P20 better even though power plants include DC-blocker).
Sirius is a complement to Syncro Uni and can be swapped for an upgrade at a later time.
As an alternative option, a used Entreq Cleanus might be worth exploring.
PS Audio power plants are the most musical solution I’ve heard.