Shunyata vs. Audience vs. Bybee?

Audience 6TSSD has best stage,bass, wonderful open sound.

All of the Audience power conditioners are great and the non-teflon versions are going for very low prices used. Plus, Audience has excellent customer service if you ever have an issue down the road. You really can't go wrong with any of their products IMO.

I believe Tweek Geek offers a return policy on the Stealth.

Power conditioning seems very system dependent. I'd try to find these at places with good audition or return policies. Music Direct, Cable Company and Tweek Geek all come to mind.