Great stuff, Jim. Turntables and cartridges is an area I do have considerable experience in, so it's good to see some of the recommendations I've given to people working out, indeed as was also evidenced recently with Jamie's 103SA
If you can get your head around the concept of marrying the BEST vintage gear, with the BEST of modern technology [and the whole 'SPPV thing'], and forget about any notion of 'newest always being best' (as it really is a false notion), then not only will you have a fantastic component, but will stand a great chance of creating a fabulous system, if you can extend the same thinking into a wider context.
That's what you've successfully achieved with your M55; the whole principle upon which my own system is based, and one of the reasons why it's given me such great musical satisfaction over such a long period of time!
It's honestly a great recipe for banishing box-swapping and 'fretting over sound', and just getting down and enjoying the music, which after all is what it ultimately should be about...
Marco.