ok from my personal experience as a non audiophile, more from the dj angle where you have to wear a pair of cans in a noisy environment for up to 10 hrs at a time, the hd25's sound awesome. almost perfect for variable environments, but they didnt fit my head. you can drive them damn hard tho
hd280's are a bit brittle in their sound and not as "rounded" to my ears. but i still enjoyed using them, especially in the studio, but the isolation fo them in clubs is second to none. they just didnt really do it for me like they did for others.
rpdj1200a's were my next set and lacked the detail of both the sennheisers but had a nice bass kick to them, and they fit me almost perfectly. as they aged tho they did lose even more detail and the nice bass kick started to get muddy.
current cans: ultrasone hfi500 dj1's. only had em a few days so its really to early to tell. theyre just starting to get burnt in and theyre coming alive. lots of clarity and detail relative to the others states (except hd25's because its been 4+ yrs since ive worn a pair so cant say). i especially like the width of the sound. seems to leave a lot more space for each element. can see how this would be wicked for gaming. they keep pace with dance music really well, havent tested them with punk yet but might have to go dig up that old ramones ep i have somewhere... i can't see why they wouldnt keep up. comfort is high and they completely surround my ears and block out huge ammounts from the rest of the world. am yet to try them in a club though. my initial complaints about lack of volume from my ipod are starting to go away as they burn in i am feeling theyre giving more for the power fed to them. but it may just be my ears adjusting....
i will concede though that my tastes and prefference vary greatly from the vast majority of people around these parts. but my requirements and usage also vary greatly from most peoples on here. other cans ive enjoyed using have been the 7506's. wicked headphones. almost no complaints about those. but their reproduction may be a bit flat and not so smooth as most 'philes would like.
also i liked the akg 141's but havent used them much apart from in my friends studio quite smooth and rounded but my friends studio is damn clean and its possible they may not shine as well in the real world of varied sources, someone else may be able to elaborate further though....