I want peoples opinions on best ac conditioners

I own a P500 and am looking for advice if to upgrade and if so what to upgrade to. I hear the Audio Magic Stealth and the Shunyata Hydra are supposed to be awesome. The only thing is I like the concept of regenerated constant power.Does constant voltage and/or regenerated power make a significant difference or would a conditioner as the ones I've stated above or similar be a better choice?