I've got a magnesium Gray Research 108 off to Karmadon in the Ukraine for a restoration of the finish. It has a GE RPX in it, though I've heard that some have had great success with a Denon DL 103. I've got a Zu DL 103r that needs an arm, and thought I might try it (the arm is wired for both mono and stereo). I'm curious if anyone else is using one of these masterpieces, and what cartridges they've tried, and what has worked...