What $500 MM cartridges?
The question addressed to another person, but in my opinion there are many.
Those moving magnet carts in NOS condition with genuine Stereohedron styli are not even the top models, but they are better than many MC cartridges:
1) Stanton 881s or mk2 version
2) Pickering XSV/3000 and XSV/4000
If you ask for the cheapest possible superb MM for about $350-750 the Stanton/Pickering have so many followers who can swear those Stereohedron models are great and much better (in terms of price/quality) than most of the new MM in this price.
I can also add Sony XL-50 with Boron Pipe cantilever as a great sleeper, I bought a few NOS samples over the years and compared this model to much more expensive MC carts in my system.
With $700 - 2000 budget the list of amazing MM or MI cartridges is much bigger and very few LOMC can compete with them.