Stereo Amp To Match With Magico V3s

I want to replace my Marantz Reference Monoblocs with a stereo amp to free up space for a Shunyata or Audience power conditioner. I am looking at Pass 350.5, BAT VK600se and perhaps Gamut D200 mk iii, all used. Budget is $7000. Speakers are Magico V3. Preamp is Esoteric C-03. I think a power conditioner will take my system to a higher level given that power in my town is not great, even from my dedicated 20 amp outlets. I would be happy with the amp switch so long as it the stereo amp does not degrade my sound and sets the stage for the power unit. Currently listening to vinyl primarily (Basis, Herron, Ortofon)and enjoying rich midrange and well defined bass. Thanks in advance for your input.