Cartridge for Technics SL-1200G or SL-1200GR


I've been using a Technics SL-1600MK2 since about 1982.  I'm currently using an Ortofon Blue cartridge.  I have a NAD M12 pre, M22 v2 PA, and Tannoy 8 dcti speakers.

I plan to upgrade to a 1200G or 1200GR and wanted some cartridge recommendations from current owners.  I've considered the Ortofon Black for either, but I'm not sure if that would be overkill for the 1200GR. The Blue sounds pretty good with my current setup, so how much improvement could I expect if I went with the Black.  
128x128oldschool1948
I sold my VPI Prime after getting the SL1200G.  I find the Technics superior.  For the first time, my analog rig bests my digital equipment.  Another plus is no acoustic feedback which I did get with the Prime and the Scout before it.
I am currently using a Lyra Delos with an Arche headshell on a 1200G. Sounds great. Other cartridges that I heard that are really good on this table are the Ortofon Cadenza Bronze and Winfield. Very organic sounding on this table are the ortofons. I am going to get one down the road.
The SL-1200G /GR are very nice turntables, but I feel they aren’t -that- much of a step up from the SL-1600mk2
The plinth and platter of the SL1200G are much better damped (the SL1600 has no damping in the platter at all) and the plinth of the SL1200G is also more rigid. This makes for a more neutral 'table, and its also more speed stable. The better your system, the more you hear these differences, especially with the volume up.
After much thought, I’m going with the G.  I’ll start with my Ortofon Blue.  I’ve never used an MC cart, but plan to buy one.  

I want to thank everyone for the advice and recommendations.