Moon 600i or Levinson No. 585 for Dynaudio Contour 20i

Hello all. As my u/n suggests, I am a Noob as regards audio gear. When I purchased the Contour 20i I gained an appreciation for what you can accomplish with good gear. Unfortunately, I'd started with Class D at the the amplification stage and I have learned that Class D is not best for Contours. I am considering the above (and maybe some Series 1 VTL MB-185s that are represented to be in mint condition). I have heard that Hegel and Octave could be options, but I would be buying either of the above used (600i, MB-185) or B-Stock (Levinson 585). 

Speaker placement is 7' triangle (relatively), but I listed at moderate to high volume. Tastes run the gamut - Classical, ambient, jazz, R&B, hip-hop, classic and modern rock. My only source is my Chord Mojo, via Mac Pro, via Audirvana (though if I buy the 600i I may keep my Marantz SACD 30n). I listen to high-res and MQA when I available, but a lot of music is not available in high quality formats. 

Thank you in advance for any advice.