I had a Sennheiser something before, they were nice but they got worn after a while so the cover on the sponges kept falling down and thus I left little black stuff all over the flat.
This Christmas I got a set of AKG 512 headphones. I like it so far as it fits really well on your head, but after a while your ears may hurt from the pressure. But the sound quality is superb, prog-rock songs sound fantastic.
I'm no expert though, hopefully someone who's more knowledgeable will be able to help you.