Your daydreams are so far out of my league that I've got nothing to offer other than a little perspective.
Digital Questions:
How much do you think you'd gain over the Exemplar Modded Denon to justify what would probably be a huge increase in cost?
Is that fractional gain worth it to you?
Do you really feel like your source is the weak link?
Vinyl Questions:
Do you enjoy vinyl? As a medium is just isn't for everyone, it's fussy, can be a serious pain to setup and availability of albums is pretty variable. For me it's mostly a lazy thing, when I sit down and listen I want to be able to a) jump around when I want without having to jump up and be able to listen to more than 4 tracks before having to get back up and flip the black disc thingy.
One other can of gas to throw on the fire - have you given any thought to going balanced?