Samson SR850
Superlux HD668B
I've got the SR850, it's very nice. Standing around in snakewater middle, I can hear the waterfall from second. It's easier to notice the background audio for anime in all sorts of scenes.
As for comfort, it's got a very large driver but the padding wasn't deep enough for my ears so I inserted some cotton to make more room. It's very comfortable.
I've never tried an Ad 700/900 though.