The D2000's are not bad if you get them around $200, you can easily resale without much of a loss. And it will sound pretty decent, not too bad at all. But in the end I ended up selling them because they are generally slow, mids are recessed, and bass is bloated. And yes, I did the markl mode on my pair. I also found a lack of body in them, and synths were not textured as well as they are with say a 701 or a DT880. I would recommend going with a Beyerdynamic DT-880, 2003 model. I had the 600ohm 2005 version a bit ago and although they are super detailed and clean, they ultimately were too sterile and just plain cold for my tastes. The 2003 model can be purchased for $200 and under in the FS forums, there were a few that had popped up recently, one of which I purchased
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The Denon's are not bad, but once you hear some of the other cans out there you see that they lack in some areas. I had them amped out of a X-can v8, which really cleared things up and took the bass deeper, and although much improved the Denon still retained its core problems.
Oh and my music tastes are pretty much the same, IDM, Techno, Electro, Downtempo, Ambient, Modern Classical... with some Classic Rock and Post Rock.
Have not heard the Ultrasone.