I've been trying to make some sense of the terrain - so to speak - of Champagnes for a couple of years, albeit without your characteristic focus (and, I dare say, resources).
Mostly I'm limited to NVs, among the best of which I've tasted are the Bollinger Special and Vilmart at near $50; Roederer Brut Premier typically gets high marks in this category, but I'd need to open another bottle to refresh my own memory. Apart from these, I haven't found much to write home about, and plenty I'd as soon drink a Loire or Jura cremant ahead of, including the often-praised Pol Roger and Perrier. Moutard's NVs, under $30, head up the value category, and are weirdly good at the price. Think Jadot Chardonnay.
I have a few vintage bottles that are still maturing - so far, little experience there.
Non-dosage is an interesting category in its own right, and I'm finding them often to be more interesting and characterful than their stablemates, to my taste.
Peter Liem's book is a bit of a classic. Or, alternatively, there's the memorably-titled "Let's Get Fizzical."
Huge experience on the board on the topic, nearly all better-qualified than me to offer suggestions. Looking forward to reading your progress reports.