Bub plays Kays but he doesn't play a '38, at least not any more. He's got a 60's S-1 and a 50's M1-B. The S-1 has been hotrodded by increasing the neck angle with shims in the mortise.
Lots of bluegrassers like American Standards. Marshall Wilborn plays one, and I know Barry Bales uses a '36 for most of his studio work.
Todd Phillips' Framus is a beast. I'm trying to find an old Framus like that, so if anybody has a line on one please let me know.
Wish I could've heard Cary Black's bass, my dad said his tone was incredible.
I've switched from a ply to a hybrid for my main axe... better tone and sustain. It's a Shen 150, and I LOVE it.