Power Conditioner Suggestions

I'm coming off of a Monster 3500 Mk II unit and need a nice step up...$1k to $1400 used range. Thinking about Blue Circle, Richard Gray, PS Audio, Shunyata...etc. It seems that there isn't many head to head comparisons out their. Has anyone done direct comparisons? While I'd love to include Audience or Walker or Thor in this discussion, I can't reach that far!?!

Thanks for your thoughts