I recently added three dedicated circuits using 10/2 romex on 20 amp breakers and the Wattgate 381's. It seemed a bit expensive at the time However you can pick them up for around a $100.00 or less used. IMHO there was a immediate improvement in my ystem. It cleaned up the ground making the system quieter, darker and more detailed. I must admit that I no longer feel a need for power conditioning. My only mistake was pulling three (3) circuits instead of four (4). I followed the basic rule of one circuit for the amp, one for digital (CD) and one for analog (tube pre). My problem now I added a turntable and tuner so I am tapped out waiting to get another circuit puuled. Other than that life is great. I can't comment on the other devices as I have not used them, and Wattgate is probrably over priced but it is the only receptacle that is patented for audio that should be worth something. You definitlt don't want off the shelf home depot.
Happy listening.
Happy listening.