750 US MC cartridge options

I amthinking of upgrading to an MC cartridge in the <750 US price range,I am familiar with the Denon 103R (great cart to my ears) but there are some other options from Zyx, used Koetsu Black or Sumiko which I also found interesting.

I will kindly appreciate your comments/suggestions of options you might consider based on your experience, please check my system below.

Fernando