http://www.transair.co.uk/headsets.asp
Good comparison of headsets. I personally have the Sennheiser HME 100, it is lighter, cheaper, and has a
far superior noise reduction to
any David Clarke headset. In fact I don't understand why people would choose the DC over this headset in this price range, the HME 100 is far superior. I've used many different headsets and went for the best performing head set not the most popular brand.