Best DVD Audio Player Today--New or Used

I'm planning on upgrading my Esoteric DV-50S to a new K-01 or K-03. Assuming I get the K-03, I would also like to get the best DVD Audio player I can buy to continue to play my fairly substantial collection of this otherwise out of date format. What would you recommend that would beat the DV-50S besides the obvious cases in the Esoteric line? What about the older Meridian 800 reference? How would these compare to the latest Oppo or other players? Thanks in advance for your reply.