I just received the G with and Ortofon Quintet Black MC cartridge. The SQ over the 1600 and the Ortofon Blue MM is like WOW! The Black has so much more detail, music depth, and pure richness. I'm quite satisfied with my purchases.
I'm going to let this settle-in and enjoy it for a while, before I jump into my next major room upgrades. As a next step, I'm trying to decided between a tube preamp or room treatment. The preamp seems like the next logical step, so that I can "tune" the room to the equipment. That is, aside from upgraded phono and power cables for the G, which I will do next.