I agree with a number of Johnnyb53's suggestions. You can figure out the tone arm effective mass and cartridge mass and complaince questions by referring to Vinyl Engine.
Also, I own both the Grado Sonata ($500) and the Clear Audio Virtuoso Wood ($550-$600). IMHO, the V Wood sounds better than the Grado Sonata, but both are very good. If you're "spoiled" by the CA Maestro, you might consider the V Wood.
I also heard and read great things about the Ortofon 2M Black ($559). It's supposed to be a super cartridge.
I'll leave the MC/MM debate to others.
Good luck.
Also, I own both the Grado Sonata ($500) and the Clear Audio Virtuoso Wood ($550-$600). IMHO, the V Wood sounds better than the Grado Sonata, but both are very good. If you're "spoiled" by the CA Maestro, you might consider the V Wood.
I also heard and read great things about the Ortofon 2M Black ($559). It's supposed to be a super cartridge.
I'll leave the MC/MM debate to others.
Good luck.