Koetsu cartridges - what arms work?

I am quite pleased with a Koetsu Rosewood Signature on a Graham Phantom arm. I didn't try the Koetsu with other arms, so I can make no comparisons. However, I wanted this cartridge because it's a little on the lush side, like the fabled Koetsu's of old, and the arm is transparent and neutral, avoiding any undesirable interaction with the cartridge and letting the Koetsu sound through. It's a good combination.

There is a Walker availble for $20k. Still too much for me. But there is hope for the regular guy. That's about the same or less than say a Redpoint, Triplanar, ZYX Universe.
Let's face it, the bottom will drop out of the tt market sooner or later.

I've gotten the best performance (ever) with the new Black Diamond linear track arm. Unfortunately that is available only on the Walker turntable.

Before moving to the Walker I ran three different Koetsu cartridges in a Triplanar, a Graham 1.5, 2.0 and 2.2, plus the Versa Dynamics (arm and TT combo) and I had good results with each.

Word is, the new Graham Phantom is another world above the older models I had, but unfortunately I have not been able to hear one.