Any Koetsu you want is possible when you are a close friend of the importer (NOT the distributer). Fortunately for me, that is the case here. Currently I am running a 'prototype' Urushi body with Rosewood Signature innards. Before this I had a Onyx Platinum Diamond Cantilever. Very nice cartridge, but my continuation of the ol' education comes first.
I got to see, touch, and hear the Tiger Eye Diamond Cantilever that HP currently has...SO BEAUTIFUL. Even so, I think my next Koetsu will be a Rosewood Signature Platinum Diamond Cantilever. That is, when I finish school, of course.