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
rapogee
Well said, but I think most Grado cartridges, if not all of them, are based on the moving iron principle, not MM. At least the best ones are. To the OP, you may want to look at the very long thread on MM and MI cartridges here. You will find more good ideas there than you can possibly sort out, re an inexpensive great sounding cartridge.
I dont think the Grados fall into the neutral/ultra resolution type he is looking for. The Soundsmiths offer alot of what your looking for.
I actually have a Grado at the moment, and for years before have been a Grado fan. I am thinking of something new since there are plenty of choices. Surprisingly enough with the advise provide by some of you adn with respect to all, I did the find the Grados to be a little on the neutral side compared to being forward. Wonderful cartridges for sure. Please do keep them coming. Thanks
Dear Rapogee: All posted advices are very good especially the Maestro one.

Inside your budget INHO this latest AT model is a very good alternative too:

http://www.ebay.com/itm/Audio-Technica-Stereo-Cartridge-AT150ANV-/350714266581?pt=US_Record_Player_Turntable_Parts&hash=item51a83303d5

Regards and enjoy the music,
R.