Power conditioner

No Shunyata or Synergistic Research?  I love my Shunyata Gemini 8 and MPC-12.  Have also heard Everest and Hydra Sigma.  If you can find a Hydra Sigma used, they are a steal.  Sorry no experience w these but figured I'd ask why you are only considering these brands?

They are very different products.  Keep in mind that the AQ 5000 is a 20amp unit and will need a 20amp power cord. 

I'm using the AQ 5000 on a 20amp circuit and I'm very pleased with the performance. 

The Audio Quest Niagra. It is a power condtioner. It is nearly universal that power conditioners have a very positive impact. There are very isolated instances where folks have really clean power and do not benefit from it. 

Power conditioning is sometimes helpful but nothing beats a PS Audio power regenerator.

….nothing beats a PS Audio power regenerator.

battery power like Stromtank is superior, expensive unfortunately