I'd look for balanced power transforers/systems. They can yield up to 120dB common mode noise rejection while providing multi-kilovolt protection from lightening, surges, brown-outs, etc. Many have added filters to remove further noise without limiting dynamics.
Beware though, many cheap (and high priced) "conditioners do have a negative effect in certain systems. The best I've heard about are:
Exact Power
Equi=Tech - big players in the pro audio and TV industry.
Richard Grey Power - I personally had his Powerstation 400 and Pole Pig in my system and they wored wonders. I have a terrible 60/120Hz hum or buzz in my AC line and the RGPC units had my system sounding dead quiet. Of course, I have low power SET amps, so my current demands are nothing like yours.
Beware though, many cheap (and high priced) "conditioners do have a negative effect in certain systems. The best I've heard about are:
Exact Power
Equi=Tech - big players in the pro audio and TV industry.
Richard Grey Power - I personally had his Powerstation 400 and Pole Pig in my system and they wored wonders. I have a terrible 60/120Hz hum or buzz in my AC line and the RGPC units had my system sounding dead quiet. Of course, I have low power SET amps, so my current demands are nothing like yours.