Thanks! WeatherProof iPod Overhead RZR Audio System looks nice, so I wrote them about one for commander.I suppose it is a matter of what you are wanting.
Do you want a full blown system with an amp, sub, speakers, and head unit or something like an overhead console with speakers built in and an iPod hookup?
SSV Works make some nice stuff you can check out:
SSV Works - Side by Side Vehicle Specialists
I am not seeing anything specific to the Commande yet, however, that does not mean they do not have anything.