You've run some pretty fancy MC's, but the _______ MM cartridge really impressed me

No question, the Technics EPC 100MK4, a conventional MM with super low tip mass and all the details done right. It has more bandwidth than any MC with flat bandwidth to 80 kHz and a resonance of 100 kHz. It wasn't officially imported into America but in the 80s many of the most famous mixing engineers used it.

The problem with selling it was it would have been a $500 MM by a middle hi fi company Technics when exotic MCs had taken over the market and Technics knew no one would buy it.

The Nag MP500 has been superb, and is the best of the MM genre I've own or heard.  

Another vote for Nagaoka, I use the 200. I like it over the zu/denon 103 and the mid-priced AT my buddy has. My plan is to continue up the ladder eventually, I'm in no hurry. 

I’ve been MC since the late ‘80s (Monstercable Alpha 1), but I did run a Dynavector 10x5 for a while when I needed high output temporarily and was very impressed with what it did at it’s price point.  Not MM I know, but a plug and play alternative in most cases.  

@lewm Just another opinion, that does not help with the encouragment of any individuals who may develop a curiosity/interest in this type of Cart'.

My follow up investigations after the demo' of the Ceramic Cart' introduced me to others who have adopted these Cart's over other readily available options and I also learnt that some have even gone to the extent of producing a modified Phonostage to suit the Cart' in use.

My experience has been to date, I was demo'd a Ceramic Cart' that had a Paratrace Styli as a exchange part. I liked what I was being presented and over the course of a day had a few revisits to the Demo' room and had some of my Albums Tracks played.

The Cart' used in the demo' system replayed my Blues Tracks just as I wanted to hear them, and was not too off putting on other genre of music, the Roger Waters Q Sound recording Bass Line, was delivering the usual system destroying presentation as recollected from any other demonstration it has been used in. 

For the experience of this Cart' to be maintained in my own system has not incurred to much outlay, and the Modified Armature and Styli has only added a small cost, as it is being carried out at the time and in conjunction with another Cart's rebuild.

I am happy to fulfill this experience yet to be created in my own system, as well as make it known it is my intention to do so, what ever the response is to such.