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.

I don't know of any one place that describes each of the Koetsu line. I have read reviews of single Koetsu cartridges in magazines over many years. Manufacturer's/distributors' literature typically praises every product in a way that obscures differences. A cursory Google search turned up the following review of three Koetsu's:

http://www.10audio.com/koetsu.htm

Of course, listening to them yourself would be best, but hard to do.