So, for the last few weeks I've had a pair of HD 700s on my head. I picked them up on eBay from a Norwegian guy (as you do). They looked and smelled like new, so I guess he didn't like them.
I've been mostly watching The Wire with them, but interspersing that with a bit of music of various genre, and I must say that I'm very impressed. They do nearly everything that the HD650s do but better. They do have that 'spike' everyone rattles on about, but believe me when I say that I was surprised that my ears didn't bleed when I listened with them, such was the hype. These work pretty well with most things, and absolutely wipe the floor with the HD 650s in terms of dynamics, scale and transient response. They are super, super fast sounding headphones. They are listenable with trance/hip hop, but are not bass-head headphones. They still have bass, don't get me wrong, they are slightly better than HD 650s in this respect. The first time I listened to anything classical/orchestral through these, my jaw hit the proverbial - they are quite amazing in their ability to create scale and space around instruments and do a very good job of throwing out a convincing sound stage. The timpani drums in Zarathustra 'Fanfare' have a real tangible 'the-player-is-beating-the-crap-out-of-the-drumskin' level of detail, you don't get this with HD 650s.
I took a punt on these, and was completely ready to give them up if they didn't jive, but now I can't see me doing that any time soon. I think of them like K701s without an artificial, forced sound stage and with a humanly sensible amount of bass.
Next stop could be a pair of HD 800s...