According to the few impressions that I found, the 404 Limited probably doesn't worth that much extra money over the 404 (or even the 303) but you may be able to get it cheaper at Yahoo Japan. By the way, there is two there at the moment, if somebody is interested.
The old Lambda Signature could also be very interesting and also the Sennheiser HE60 is said to be on the bright side as well. Although it is still very expensive and if something goes wrong with it, it may cost a fortune to repair which is makes it even less appealing than it already is (even so, this is still something I would really like to hear).