It looks like the previous deal for Senheiser HD650 is back on same price again! Price went up to EUR316 when I checked a few days ago.
To help you out, have a read on headphones comparison on how they par with other cans:
http://www.head-fi.org/t/634201/battle-of-the-flagships-50-h…
As others have suggested, these requires an amp to make the most out of it. However a good pc soundcard is a start IMO.
Merci!