Doing some more reading, I'm seeeing that the Custom RIs come with a nylon nut. Almost $7K for a guitar and a nylon nut!?! WTF is that?!?!
Anyway, seems like what I'm hearing is that the Moderns really do sound more.. modern, to the extent that if I was to compare one of those to a good Eclipse there might not be a significant tonal difference. That if I want that classic LP sound I should be looking more at a Custom or Standard. Sound right?
...Or, the difference with the chambering is subtle but there, if I had a Modern / Supreme and put some OG PUPs in it it'd get me there without a 10lb axe on my shoulder? Whatever I get will be gigged.