I've heard all of the top offerings and the K-1000 and HP-1000 are my favorites and best of all for my goals. No other phones reach the goal of disappearing and leaving you in the studio or concert hall while having that "magic" quality that's hard to explain.
I'm fortunate to have a pair with fresh drivers thanks to audiofiler (wish I would have kept my backup pair too), but am still sad to hear about the lack of NOS drivers

I wish Joe would pass the torch or continue on with his masterpiece somehow. Even though my drivers will last a long long time, I worry that nothing will be able to match the sound of the HP-1000 even with future offerings...