In 5.1 only the Razer Barracuda HP 1 has very good reviews. Its for $130 (about 6k) and one reviewer even mentions thats its good for listening to music and as good as a studio quality stereo phones in the same price range. Its comes with discrete amps for each of its 8 drivers and powers from a USB port.
Well, you can order them if you have a credit card. But you might what to consult with the audiophiles here first since you said your main use would be music. The only gripe I can see is that they are a bit costly because of the brand. $80 would have been a nice price for them.