I still feel that the utopias (with DAVE) lack in the bass presence. They are very clear and articulate, but the 1266 just has more of the low end.
It all depends on your personal preference. The utopias are far more comfortable and just outstanding build quality.
The 1266 don't fit as well, are heavier, and really should be considered ear speakers. The sound is remarkable. I'm on the list for the phi upgrade. Should make them more efficient and perhaps slight dynamics improvement.
I run DAVE through my wells audio headtrip amp ans it had been a true pleasure to listen to them.
Can't comment on susvara 1000V2 but I'd imagine thats a great pairing as well.