Oh, I love the Audio Technica AD700's soundstage so much. It just makes live recordings sound so...real. Their soundstage almost competes with the my bookshelf speakers at times.
I haven't heard any other open headphones yet, which is a pity. I'm just hoping that AKGs, Beyerdynamics, etc will have that "real" sound.
Anyway, thanks for the list! It shall help me greatly when I shop for headphones in the future.
Here are a couple of cans that are the soundstage-head's worst enemy! Audio Technica M50 and Etymotic MC5/MC3. When listening to them, whatever you hear is pretty much always "inside of your head." But you guys probably already know about them.