Call me ignorant but...
What has you firmly convinced that you need a new cartridge??
You have an EXTRAORDINARY tonearm!! Count yourself extremely fortunate.
I'm not a Nottingham fan. Your existing cartridge is probably fine. Sell the Nottingham and use the money towards a Raven or if need be a Baby Raven. OR perhaps a better TT stand. OR perhaps better matching for your existing cart - if it is also an MC type.
What speakers are you using?
What Preamp?
What amp(s)?
If you REALLY need a new cartridge... IMHO, at much less loot, a LYRA Argo i, Dorian or a Soundsmith re-do is probably more cartridge than most systems can resolve.
My prediction is that what you are seeking lies in upgrading other parts of your system.