Argyris
Head-Fi's third most long-winded poster.
I laugh when people say end game. Every-time I have said that I end up upgrading again. But that is part of the fun.
That's assuming the point of the hobby for everybody is to chase after the next new gear. Some of us just want something we can live with that doesn't sound like there's a train wreck happening that we have to try to listen to our music through. The HD 600 is the first headphone I've found that I can 100% say satisfies that requirement. Until a confirmed successor appears, essentially an HD 600 with sub bass extension, I'm perfectly happy to call my current HD 600 end game. Choosing anything else would currently involve sacrificing what makes the HD 600 so special (coherence, tonal balance, complete lack of fatigue), and I'm confident that any gains I might make in one dimension (e.g. bass extension) would be outweighed by the loss of that HD 600 secret sauce.
Instead, I'm currently concentrating on finding a closed headphone that doesn't make me want to rip it off my head and chuck it across the room and wish I had the HD 600 instead, for all those times when I need the isolation or else don't want to annoy others around me. The HD 569 I just bought shows some potential, though like all closed headphones it has its notable flaws.