Beating the dead horse here a bit, but I wanted to respond to the SRH940 vs. HD650 comments...
Let me first say that I like the HD650 a lot. However, I've heard the newest version of the HD650, and I'm still not quite sure how anyone could say that the SRH940 is warmer sounding. I don't mean to insult anyone's perception, but I just see the HD650 as having a very warm sound overall. That is not to say that the HD650 lacks detail in any way. The HD650 is still a very revealing, dynamic, headphone with a lot of resolution. In my opinion, the HD650 has a knack for doing a lot of things at the same time--it is dark and veiled yet open and clear at the same time. It was surprising for me to hear for the first time...the "veil" as people say, was the first thing that struck me about these headphones, and it sounded to me as if they wouldn't be able to produce the brighter, treble-ey sounds as well. But, then you hear a cymbal and it shimmers just like it should, and stands out above the darker sounds. That being said, the SRH940 sounds to me like the HD650 with less veil, and brighter highs with more emphasized treble...and sometimes I wish the SRH940's had less of that, because it can be harsh. I've paired it with tubes to try to tame the highs. I owned the SRH940's first, and ultimately, I decided that the HD650's weren't different enough to warrant purchasing them as well.
As someone said, the HD650's do scale very well though. I've found that a lot of speaker-audiophiles tend to like the HD650's a lot. There is something elegant about them that an audiophile can appreciate.
On an unrelated note, does anyone know if there are any headphones that have mid-ranges that compare to the orthodynamic headphones at all? And, which orthodynamic headphones provide a better bang for the buck--the lcd2's or the he500s? Or something else? I see a lot of people favoring one or the other, but reviews seem to favor the he500's overall, and given that the lcd2 costs a decent amount more, can someone tell me exactly why they see the lcd2's as being worth the extra money, instead of getting the he500's and putting the rest towards a better amp?