Thank you all for your replies; plenty of food for thought.
Given the following list of 'candidates', what are your opinions:
David Clarke H10-30
Avcomm AC-90
Telex Echelon 100
Peltor 8006
Pooleys Hi-Fidelity Headset PY(E)PH2000
My first choice is probably the David Clarke, but I might be being led by the fact that EVERYONE knows David Clarke! The specs of the Peltor 8006 look good but I have extensively used Peltor ear defenders and have found that the adjusting mechanism (plastic tube sliding over the wire frame) becomes useless in very short order. The headsets appear to have the same gizmo... any thoughts on that?
Finally... anyone care to have a bash at answering my question on the electret versus dynamic mic conundrum? Does it really make any difference or is it just a manufacturers 'hook'?
Thanks again,
WhiskeyDelta