Best cartridge for Frosten-modified AR XB tonearm

I have a nicely restored XB on a new real walnut plinth, with Steve Frosten's modified tonearm that uses sapphire bearings.  I'm willing to add mass to the arm and the counterweight if I need to, and I'm wondering what the BEST cartridge I could buy for it would be.  I'm not looking for the best budget cartridge.  Started with a Stanton 681EEE, moved through the vintage Shures, and now have a very smooth SAE 1000e, but it is a high output MC.  I'm looking for a low-output MC cartridge that's not too low compliance for this arm.  Thank you for any help!