In terms of closure to this post, I have purchased the AZ Silver Ref. Mark II's and am currently listening to them. They sound great between the Cary and Plinius. I immediately noticed improvements in soundstate, high frequency extention, and and overall air or loftyness in the music. For those that believe that cables make no difference I invite you over...
If anything the Cary 303/200 is a bit forward-sounding (based on the research I have done). These AZ bring that out but I'm still happy being the Plinius and Soliloquy are inherently warm. Now, if I can only find something under $2k that has some good old analog PRAT...