Chakster, I was thinking about this cartridge, but it's not MM;
https://www.needledoctor.com/Koetsu-Coralstone-Platinum-Phono-Cartridge
To be honest, I'm quite satisfied with the Grado; it reproduces nuances quite well. People who didn't choose Grado said they were musical, and that's my major requirement.
No, I'm not trying to sell Grado, my main point has been about the effort it takes to find one's own cartridge, the one that reproduces his musical requirements; this hasn't been easy, it's taken years.
The Pickering and Stanton cartridges I saw on the jukeboxes were Mono, just like the music on those 45's. Some people claim it's better than stereo.