Recommendations for Power Conditioner Upgrade From Old Shunyata Hydra 8

I have a 19-yo Hydra 8 with a Taipan cable that I'm considering upgrading.  My recently upgraded system is about $60K in value. I do mostly streaming.  System is:  Levinson 585.5  integrated, Aerial Acoustics 7T speakers, Naim NDX2 streamer with Naim XPS DR power supply, and an old Audio Research CD3 I use as a transport into the NDX2.  The current setup with the old Hydra 8 sounds great.  I've talked to different dealers who say I can improve the sound of my system with a modern-technology power conditioner.  Dealers have recommended: Isotek EVO Aquarius or Sigmas, another recommended Audioquest Niagra 1200.  The world of power conditioners is confusing to me so I'd deeply appreciate your thoughts.  If the sonic gain is there, my budget could be $6K.  Thank you!