Quote:
A portable Ultrasone 900. The drivers are only 40mm.
That's not impossible. The audio-technica ES10s are the size of a Grado but they managed to shoehorn their full-size 53mm driver (that's right, same size as ADxxxx series) inside. I don't know how they did it, but they sound great - I loved the pair I auditioned. As for Fanny Wang's 60mm driver, that might be a bit...ambitious.
Regarding the poll, I voted in the top four categories: Comfort, build quality, efficiency and closed. I used to use a portable amp (NuForce Icon Mobile), but using it without an LOD felt kind of redundant, and they're hard to come by for anything other than an iPod. Now that I have an HM-601 though, I don't mind slightly more power-hungry headphones.
I'm not too picky about size, as long as they're not too cumbersome. Besides, circumaural headphones isolate the best, since my HD25s don't quite fit on a melon head like mine. In retrospect, I think 'isolation' should have also been a criterion.
I'm also surprised more people didn't vote 'detachable cable'. Trust me, once it happens, you'll be thankful for it.