of the the of sennheisers i do have, PX100, PX200, CX300, HD 200, HD205, HD212, HD215, HD 433, HD455, HD465, HD470, MAH 40, MAH80, HD25-1's i know i've forgotten a few, but i've had the HD280's in the past and i couldn't get on with them. I thought the bass was too recessed. the detail was there, but they left me wanting.
for isolation, the HD25-1's win hands down. for a non
'noise cancelling' headphones, they are near perfect at cutting out ambient noise.
http://www.rebelio.co.uk/app/urwfilt...ack/index.html
any way after three months, the headband had cracks and stress fractures on them. the Shop assistant said it was the way i was folding them, but the truth was i'd never folded them. no other HD280 owner seems to have been affected, if they have, they're not telling.
it depends how much you have to spend? i love the HD205 and HD212's, because they have deep (some say overpowering) bass. But the HD215's and the HD280's are a little bit more .....bas shy.
my one bit of advice is, if you want studio headphones and your budget is under £50 then stay with sennheiser. don't stray into Sony territory what ever you do.
having said that, you might want to think about the Equation Audio range. I found a seller on ebay who is the only authorized seller for Equation Audio on ebay, and they ship world wide.
http://stores.ebay.com/dianasworldtn...QQftidZ2QQtZkm
I've got a pair of RP21's which are gaining a massive following.