I'm currently looking for new closed headphones to get and I cant decide between these two contestors, I keep hearing D2000 are awesome and theyre highly upgradeable later (markl mods etc.) which will make them even more awesome, and they have great bass. DT770/600 is neutral balanced headphone which is awesome too. I have AuzenTech Bravura soundcard which will propably drive D2000 fine enough if the threads I read are true so the driving problem shouldnt be a problem, and if I happen to dislike the sound I can later get an amp that is 100% sure to drive them smoothly.
I usually listen to electronica and I am a bit of a basshead, but I also listen to all other genres but not so usually as electronica which is my main genre and source of life. I watch lots of movies so soundstage is also pretty important.