MM Cartridge recommendation needed

I just succesfully completed a re-wire of the tone arm on SL-1200, I replaced the stock wires with Cardas litz wires. I also moded the standard cartidge mount to eliminate the cartridge leads. Now the tone wire clip directly to the cartidge and are soldered directly to the ICs. The end result is remarkable.

Currently I am using a Ortofon OM cartridge with an night club E stylus.

On my second (un-moded SL1200) I have ortofon 2M blue, this is much better than the OM but I am relunctant to remove it from its headshell and remount it. This is because it took a while to mounted correctly. I would also like to keep as a reference.

So what has this to do with my question?

I would like to have some recommendations on MM cartrdige to replace the OM. I am looking for something in the range of the 2M blue or possibly a notch above. I was considering the Clearaudio Aurum classic or Alpha.