I tried the PS1000 today at a local store. Listen for about an hour on 2 different amps. And I own the Ed8, have owned the HE5 (not LE), have never heard the D7000, but have owned the D5000 for a while, never heard the limited stax, never heard the JH products because I don't find custom fit IEMs comfortable at all. I'm intrigued to hear the ThunderPants......but now that I've added the PS1000 to my own equation, I can confirm that the 3 you mention as the top players are in fact the top players. The PS1000 for me is the most overpriced piece of audiogear on the planet, but I won't go bashing it (too much) as I know people love it. I truly found it very comfortable, almost as much as the HD800 and more than the LCD2 or T1, but the sound quality was just embarrassing. I felt actually embarrassed when the salesman with a degree from God knows where audio school looked at me in the face and told me these were the world's best headphones. I understand sound is all opinion, but the midrange on the PS1000 sounded to me as if the engineer who designed them has experienced odd hearing loss. The reproduction was incredibly U-shaped. This lent itself well to Classical music in my opinion, but the soundstage was lacking compared to other contenders. For rock, which is primarilly what I'd be interested in a Grado for, I thought the sound was hollowed, and ultra sibilant. The one thing I will say is that the PS1000 were ultra-detailed and the decay felt realistic, but tonally this headphone was off the mark by a large margin for me. I actually think I prefer some low-grade Sennheisers to the PS1000, like the 595, I never compared them back to back and haven't heard the 595 in years, but I found the siblance of the PS1000 enough of a pain to listen to, to even make the detail something that was worth while to me.
By the way Peter, I think the order you put them in is about right......I think the T1 and HD800 are tied for second, but the LCD2 is in a class by itself in terms of new headphones, and its a class I've only heard matched by the R10. I still use HD800 over all other phones for classical. But as an all-rounder the LCD2 and R10 are where its at. I heard the Omega 2 MKii recently and thought it had the potential, had it been a better rig and had I had more time with it, to be in the same class as the LCD2 and R10. The K1000 are very interesting, and I recently bought a pair but I don't think anything has taken my breath away on first listen as much as the LCD2