It's often said that everyone should try to listen to a Decca moving iron cartridge at least once. Be warned, it's like just one hit of heroin! You may never come back. I have two of them, the Jubilee and the Reference. These are not like the old finicky Decca-made cartridges, but are well made by John Wright, an ex-Decca engineer who has had the patents for them since about 1989 and produces them under the London name. Hum is not a problem anymore. My Benz Micro and Ortofon MCs have stayed in the cupboard for the past eleven years, and I have seen no reason to change out the Reference since I got it. Intricate detail, immediacy, and compulsive foot-tapping rhythm are the reasons. Down sides are a sensitivity to surface noise (which has led to me becoming obsessed with record cleaning. I use a Loricraft and then a Degritter), and the fact the stylus on the tiny armature is easily damaged. You absolutely cannot allow any reverse force, sideways force or even a hard drop onto the record. Wet cleaning is out as well, as any Stylast or similar will get into the cartridge (no long cantilever) and destroy the glue holding the coils onto the magnets, resulting in the cartridge becoming extremely microphonic.
My Reference is currently boxed up and about to set off to the UK to see Mr Wright as it needs a new stylus. I have two other kinds of MI cartridge to keep me going until it returns, as well as the Jubilee. There is a Nagaoka MP-500, which is a different take on MI, but very respectable in performance - even though new, it currently sounds better than the Reference with a worn stylus. That will obviously change when the Reference comes back refreshed. But it's only a fifth of the price, and a bargain at that. I also have a new Grado Lineage Statement 3 to try out. A similar design to the Nagaoka, with a cantilever that doesn't see-saw, but which has an iron collar immediately on the other side of the rubber suspension ring. I am told it will give the Reference quite a challenge, but I'll need to run it in for ~50 hours before it gives its best. By then, I'll have forgotten what the Reference sounded like!
New London Deccas have just stopped production because of difficulties getting the armatures cut. John Wright also wants to retire. It would be wonderful if somebody like Soundsmith or Expert Stylus would take over! Both places are happy to re-tip a Decca/London, but they can't replace a damaged armature if John Wright no longer makes them.
If it sounds like I am over-praising a cartridge that barely anyone uses, go check out the reviews from Fremer and the like - all say the Reference has quirks and disadvantages, but produces heavenly sound. It's certainly my final cartridge. But perhaps check out the cheaper Nagaokas and Grados if you're moving iron curious!