L;DR/Summary:
In my opinion, the Samson SR850 is the best headphone I've ever owned or have had extensive listening time with, while also being the second cheapest of these. The powerful yet tightly realistic bass, the smooth and transparent mids, and the pristinely detailed highs come together beautifully in a sound signature that is just slightly to the fun side of neutral. They work excellently for any genre I've been able to throw at them, and believe me, I listen to just about any genre you can imagine.
I have long championed the JVC RX700 as one of the the best headphones you can buy for under $100 dollars. I have to take that statement back, and assign it to the Samsons(or perhaps Superux HD668B). Heck, these might be the best you can buy under 200. They beat the Denon's I bought discounted at $130, and I'm quite sure they can at the very least take on the sub-$200 champ, the ATH-M50, if my memory serves me right. And yet they only cost $50 dollars. Because of their price and construction, you don't have to worry about breaking them and they are very mod-friendly(check the rockgrotto forums).
If you don't mind semi-open, large headphones, and are looking for a balanced frequency response, I cannot think of anything better you can get under $200 dollars. The quality of the entire frequency range, as well the musical coherence and transparency of the overall presentation are to be lauded.
