I saw mention of these HC Technology headphones a while back.
http://www.ocmodshop.com/default.aspx?a=220
If you've got a decent soundboard with an optical connection, these would be great. They offer 5.1 sound, an inline remote and no pissing around with those bloody minijack connectors. They received good reviews for sound quality and usability. The main downside I can see is that the decoder box requires batteries/ powerbrick, which wouldn't be very portable.