Hello, I've been reading for a while, I finally decided to post.
I've been trying a couple new sets, to no avail. Unfortunately, without a location around that I can test, I've had to take advantage of return policies to test, which I really don't like doing. So in order to avoid doing that (or at least lessen the possibility), I wanted to get some input from you guys before the next try. These were tested with all variations of: a Mini 3 portable amp that I built (http://www.amb.org/audio/mini3/), iPod, PC amplified output and line-out.
Applications: I really enjoy listening to music, mostly at my computer. iPod occasionally, but I realize the sound concerns with them, and I'm not worried about getting amazing results from it. I also will use these for music production/ recording monitoring, mixing and mastering. This is why open-backed won't work, feedback during recording. But this is secondary, I mostly just want good-sounding and comfortable phones for listening.
So far, I've tested:
Sennheiser HD 598 (http://www.headphone.com/headphones/sennheiser-hd-598.php)
These were very comfortable. Exactly what I wanted as far as that goes. They are open-backed though, which I can't do, and the bass response was very thin. It pained me, but I sent them back.
Beyerdynamic Custom One Pro (http://www.headphone.com/headphones/beyerdynamic-custom-one-pro.php)
These sound very good to me after around 12 hours of testing. The selectable bass response is a little goofy, but surprisingly effective. I'm not a bass-head, but in the highest setting, they sound great to me, I guess this would be my preferred frequency range. However, after about 1 hour of listening, my ears/head/and face hurt. They are VERY uncomfortable, at least for my head. Although they sound very good to me, I will be sending these back as well.
These I've only tried on, and dismissed immediately only due to "feel":
Sennheiser HD201, HD203, HD219, HD429, HDR110
Grado SR80i, SR125i
Klipsch M40, Image One, Ref One
Thank you so much for your help, I really appreciate any input you can offer!