What is your price range? What about something like the Outlaw Audio Model 975 (not that I have heard it or know much about it). Of course, it does a lot more than you need.
http://www.outlawaudio.com/products/975.html
http://www.outlawaudio.com/products/975_gallery2.html
Edit: I missed the part about the wireless headphones, I don't know how one would hook those up.