I've been looking into headsets that would give good sound quality in the cockpit of our teeners. There's a few that look to have real noise reduction, particularly for mechanical noise:

Blueant Z9
Aliph Jawbone
SoundID SM100

Any experience with these? It would be great to be able to actually answer the phone if called.

I use the Jaw bone, and it works very well. I have talked on it while driving with the windows open and all. People have told me it sounds better than when I am using just the phone. As to it being used in a 914 I am not too sure. I can't hear anything other than enigine in mine.