I can't get my mind off the Denon D5000 because I keep thinking that it could be better than my Ultrasone PRO 900. I definitely like the PRO 900 and it has really great bass, but it's just not "floating my boat" compared to all my other headphones (and it's also the most expensive one I own!). I know I want to have at least one closed headphone for portable use with good emphasis on bass because all my other headphones are more lean on bass. I had the ATH-M50, and it was good but there was nothing special about it to me so I sold it. The bass is definitely special on the PRO 900, but I'm not a basshead and I love the sound of open headphones, so I'm beginning to think any closed headphone won't satisfy me. I have to at least have one and it's come down to the PRO 900 or D5000 (or others? if there are any out there that can compete). I also tried the Kees mod, but only put different combinations of electric tape on the 3 holes which really didn't do much for me. I did not open it up to put felt and cotton on the wall of the cup, is that the most important part of the mod? If the D7000 was about the price of the PRO 900 then I would definitely give that a try, but it's not. So for the people who has heard both, which one do you like better and why? Thanks!