Speaking of MM, I drank the Kool Aid from Chakster and Raul and purchased a Stanton 881S with D81 Stereohedron cartridge on Ebay. There was a bidding war and I was lucky to get it for $250 from the re-tipper guy on Ebay (even though he is a Stanton re-tipper, this example was original D81 Stereohedron stylus). He had pictures of the stylus and it looked great. So I took the plunge. Great cartridge, once I got the Azimuth dialed in with my oscilloscope.
As far as resonance frequency, with my test records I am somewhere between 9-11 HZ lateral and 12-14 Hz vertical which I think it's reasonable for a high compliance cartridge with my tonearm. It tracks extremely well on test record torture tracks.
Jury is still out, but I think it is as good as the Ortofon Black, which my son has so I have heard it. I don't think it has the resolution of my Lyra Delos, but man it can jam, great midrange and bass. Only thing it is really tall, so I really had to raise my arm compared to the Delos. I have a Spiral Groove SG2 turntable with Spiral Groove Centroid arm with Allen Perkins new counterweight (it had weights on either side now for Azimuth adjustment), Avid Pulsus Phono, Herron VTSP-3A(r03), Music Reference RM 9 MK II Amp and Wilson Sophia II speakers
Pleasantly surprised, great recommendation from Chakster and Raul