Thanks to all for the great response and info!
I've been meaning to upgrade my trusty old Denon for some time now - I like the sound of my Monitor Audios, but they may be a touch bright on the top end. Originally considered SS seperates, but then I decided to go wholly different and give tubes a try - I love idiosyncracies, I have plenty of them myself. Also love tinkering, tweaking, and the occasional fiddling. Also have much preferred the 'thick' sound of my Fender tube guitar amps vs. various SS guitar amps so I look forward to the same experience in my audio setup.
Ok so I'm adding Cayin and SoundQuest to my list for research. Can't wait to join the club!