Cartridge for my system? Your wisdom is needed

Analog Gurus

The time has come that I am making another change in my front end analog system and I this is going to be my final one for a long while.
I know it sounds familiar but its true, other things are taking precedence over my hobby and I need that to happen 
I am looking for a phono cartridge for my front end analog rig, price is a factor so nothing over $850 since I know there is plenty out there up to this range.

My preference is, neutrality and ultra-resolution with lots of gain
The analog combo is not based of the norm and I am going to make them work together to the best possible manner

Expected synergy for my combination:

Brinkmann Bardo
Tonearm – SME 4.5 custom board from Brinkmann
Phono Preamp – Graham Slee Era Gold with Elevator (so the cartridge can be either MM or MC)

I need a cartridge that will compliment this system, Ayre amplification with a pair of Wilson Sophia’s II
I would like to try a good MC for this but will gladly settle for an excellent MM as well

Ortofon 2M Black is on the list so far and looking for more suggestions and wisdom from all of you out there.
Thanks - R