I am sure others can offer suggestions as well. All of the MM’s that I have used with the EAR have been vintage MM’s and not that easy to find: AT ATML170-OCC
AT-ML170 OCC is amazing MM cartridge, no doubt.
The AT-ML180 OCC or OFC is even better.
More affordable and not so rare is AT-ML150 OCC with Beryllium cantilever and MicroLine stylus ! Highly recommended if the budget is not high.
Rare Sony XL-50 (MM) is my new discovery (Boron Pipe cantilever).
I can add in the top list (they are very expensive): Grace F-14 or LEVEL II with Beryllium, Ruby, Sapphire or Boron cantilevers, those carts have the best profiles (MicroRidge). Amazing cartridges, expecially LC-OFC versions.
You can always try F-9 with some nice styli if the budget for Grace is not high.
Definitely the Victor cartridges: X-1II or X-1IIe