The DT-150 is quite comfortable but it does get hot for me after an hour or so, and it was a few years old so I don't know how the pads changed over time. One closed headphone that is non-fatiguing in the highs is the SRH-1540 but I don't think its that great with electronic music since its a little too polite IMO. The Nighthawk is a rather interesting headphone since it can be fatiguing to some but to me its quite dark but there is treble way up there so I think it depends on the individual. My hearing is limited to 16-17khz while my GF can still hear up to 20.5khz and she noticed the treble on the Nighthawk with some tracks. If you are looking at the TH-900 then you might also want to check out the Atticus and Eikon, a friend who has all three told me that the Eikon should be on my list for headphones that I should try.