The quality most important to me in headphones, is the way they make the human voice sound.
In other words, the best headphones for me are the ones that make the human voice most engaging. Sorry, I know it is subjective, however it's the best definition I can come up with.
I have the AKG 701, Grado 325i and Senheiser HD-650. The AKG for me is out of this league (currently collecting dust.) Between The 325i and the HD-650, I find the Senheiser to have a better bass and detail, however I find the Grados to produce much more engaging vocals.
To the point: From all of the following: Audez LCD-2 & 3, Senheiser HD-800, Grados PS1000 and GS and the HE 6 & 500; which (at least the ones you know) do you folks find to excel in that category?
Or for that matter, other cans.
Honestly, when I spend the money for a flagship can, I find it best to go try them at a store so you can get the one that appealed the most to you and not wonder if you could be listening to something better. With that in mind I wouldn't buy a $1000 can based of purely opinion.