@smatsui - great set of headphone gear you've got! I've got Susvara, Utopia, VO, and LCD-5, though I've got the VO's up for sale - great headphones but just didn't click with me and I don't want to deal with pad rolling.
I also use an Auris Nirvana, and also for the Susvara I just recently got an Ferrum Oor stack, which is awesome (I'd like to hear that Enlium sometime).
For the more efficient headphones, I've also got an Eddie Current Studio B.
I was curious about the 1266's, but for the kind of headbanging music those would be great for, you can't headbang or the cans will fly off!
What kind of DAC do you use?