I've found many japanese websites claiming to sell the sl-6000w for around 82,000 yen. Amazon seems to indicate immediate availability, although there is also a disclaimer forbidding overseas shipment. (All this is using babelfish.altavista.com to translate the pages to engrish)
On the other hand, I can't find a single Japanese site where an actual user reports having any of the three models. I assume this is a prerequisite to US availability. Has anyone seen evidence of a private citizen in Japan with an SL-6000 of any type?