I just ordered the D2000's after the price went down on Amazon to $199. I was on the fence, looking at these and also thinking about the Beyer DT 990s.
I'm new to this forum, and to the latest phones, but definitely not new to audio. For the past 5+ years I have been using a pair of MDR-7506's, mainly for my studio work but also for music listening. While they are good, they are too bright, lack warmth and lower end, and are also highly fatiguing. I'm having a hard time these days being able to listen to music on my thru my speakers due to my wife, so my headphone time is increasing all the time
So recently I decided to try a pair of Senn HD-555s as I wanted to find something warmer and comfortable/non-fatiguing - they fit the bill comfort-wise and had a mellow-warm sound, but are pretty muddy in the mid-lows, lack clarity and treble, and to my ears don't have much definition or good transient response (imho). So I sent them back, and decided to move up a bit. I haven't heard most of the phones out there now, all I had to go on was reviews and forums like this. I thought about the Grado's but thought they might be too bright (I have that now with the Sony's), and so the Beyers were high on my list - but when the price of the D2000's came down to $199 - I took the bait.
I listen to a wide range of music, rock/pop, newgrass/acoustic guitar, and some jazz and classical - but I think a good pair of headphones should be good for most types of music, so hopefully my pick of the Denon's will be a good one. I've had alot of Denon audio-gear over the years, but have never heard any of their headphones before.
One Question - My source is always CD, good receiver phone-outs - but most of the time my listening comes from the headphone out of a good Sony CD player with adjustable volume control (it has the cleanest sound). I don't know much about headphone amps - how much would they improve my D200s given my current source?