A group of friends and I bought these as a present for someone we know. He is a good musician as well as being keen on listening to music, so we were confident he would want some decent headphones.
I spent a long time looking at headphones and couldn't really make much progress in deciding; I was also not sure what to do about the open-/closed-backed choice.***
Eventually we chose these ones based on the recommendation of a friend-of-a-friend who is taking a degree in music editing (so we were pretty happy to trust his judgement). He also cleared up the open-/closed-back question for us by saying that the difference in sound-quality is very small, and that you would have to be a fantastically fanatic musicophile to spot any issues in quality of sound caused by closed-back headphones when you are talking about anything in this kind of price-range, and the benefit of being able to use them on the train/out-and-about far outweighs the barely noticeable difference in quality.
On his recommendation we got these and I have since listened on them; they are utterly PHENOMENAL. It sounds like a vastly expensive, surround-sound audio system, not a pair of headphones. The detail is stunning. Apparently this type of headphone takes about 24hrs of playing to fully break themselves in too, so perhaps they are set to sound even better.
I am no professional when it comes to music equipment, but I can guarantee you that these headphones are.
If you are looking at spending this kind of money on headphones, then, based on my limited experience and the advice of the kind of person who might be worth trusting (the guy who, as I already mentioned, advised me), these are the headphones to get.
***[If you do not know what I am talking about regarding open-/closed-back, then just google "Open vs closed back headphones" and you will find plenty of info]