Quote:
Originally Posted by
Crazy*Carl 
I have been looking at denon earcups and i think i am turned off. they seem to be pretty shallow. i wear headphones for along time( my computer doesnt even have speakers), so comfort is huge. my ears stick out some so a deep earpad is critical. sennheisers beyerdynamic and akg seem very good in this area. the denon sem like they will rest on my ears some creating discomfort after a while
1. Don't think the Denons would rest on your ears unlike you have ears of Yoda.
2. Denons are great phones. I sold my HFI580 to get the D2000 and never regretted. But since you are looking at the 780 or the 900, do not take my word
Offtopic:
Are you running your HD580 from your ipod straight? If so, in this case for you maybe you will get better upgrades of sound by adding an amp... Wow did I just go against the 'phones are the greatest upgrade' law? Bottom line is if you are unsatisfied by the HD580, you feel like there's something that is missing, go for an amp would be my suggestion. If you think they are perfectly fine, you just want to try a different sound signature, I believe the Denons would suit what you need, they are the bass kings and rumble+punch deeper than the HD580.
Senn vs Denon
Neutral vs Fun - coloured towards the bass
Both have a very expansive soundstage, if you are running the HD580 ampless maybe the Denon would even perform better out of that ipod jack in terms of soundstage.
Last but not least, such a shame you wouldn't give grados a try.