I'd like to add an in-helmet BT headset to my Arai Quantum2 (full face.) I'm looking for recommendations as to the best way to go on this to receive audio from a Zumo 550, cellphone, and preferably MP3 player as well. Obviously the reason I'm specifying BT is minimize the amount of wiring necessary.

I've read reviews of the Cardo Scala Rider 2 at WBW as well as several other manufacturers, I'm just looking to see if anyone has had a good experience with any of these yet, and in particular, if any yet have A2DP stereo audio support.