There should be a few bose-x ones going on Ebay soon. I have just watched one on US Ebay going for $600 and no bids at all...
A bose-x is way way better than anything D-C made at any price, ever. I once did a comparison (against an aircraft noise source) of the X against the top D-C headsets, and there was no comparison on comfort.
Unless you are going to sit on it, stand on it, lend it to people, etc, in which case buy a D-C.