I was thinking of a Soundsmith model above the budget. The Rega won’t work with those- but will work fine with any of the higher output models (2.12 mV).
Moving magnet cartridges have the highest moving mass. When you can reduce mass, you gain detail.
Moving coil cartridges have lower moving mass. The magnets are stationary and the much lower mass coils are what moves (by being moved by the cantilever). Downside? Think of a coat hanger. Bend it back and forth. Eventually it gets metal stress and breaks. The same thing happens eventually with a moving coil. At that point, it’s dead. It cannot be rebuilt.
A moving iron cartridge (Goldring makes these too) has the lowest moving mass. Soundsmoth calls them “fixed coil”. Same thing. The only thing that moves inside the cartridge body is the cantilever. The magnets and coils are both stationary. You’ll get the most information out of the grooves with these because the cantilever isn’t taxed with moving another subassembly. Goldring, Soundsmith, Grado and Nagaoka all make MI designs. You also get a higher precision device-it’s easier to get one thing (the cantilever) in perfect alignment with the coils than 2 things- either the cantilever/coil or cantilever/magnet assembly. That’s why MI designs tend to have the best stereo separation.