Cheap headphones have gotten so good recently.
Sennheiser have the HD599 which is almost constantly on sale for less than £100 on Amazon
AKG have the K702 which has a superb frequency response and fantastic soundstage. With technical accuracy which really isn't that far behind the HD600.
The Koss KSC75. £20, supremely comfortable, superb sound signature, especially for visual media.

It barely seems necessary to spend >£200 on audio gear anymore