Rob-F
Likes Leicas
Perhaps ypou should keep in mind that the great majority of M cameras out there do not have a 75mm frame line, so you're out of luck if you want to buy an older body like an M2, M3, or M4 as a second camera.
Well, he'd only be out of luck if he doesn't like accessory finders. Cosina/Voigtlander makes a nice top-of the-camera 75mm finder. I actually like it better than the built-in 75mm frameline.