New Arm/cartridge?

I am running Nottingham Analogue Spacedeck/Spacearm/Spectral signature (breathed on by Jan Allaerts) into Quad 99/909 amplification and Final 400 electrostatic speakers.
I feel I would like to upgrade the arm/cartridge. I would appreciate any ideas.
I have two ideas:
1. Enjoy what you have, or
2. Explain what you dislike about your current rig and/or what you'd hope to get from an upgrade.

Otherwise, how could anyone reply to your post, except to tell you what they like? Fifty iterations of "I like A" and "I like B" won't help you much, and it makes pretty boring reading.

Give us some context...