I have a lot of time between the pads of David Clarks, Lightspeeds and Bose.
The middle model (that rhymes

) Bose are great. Heavy, but they do a good job. The newest Bose don't cover my (admittedly oversize) ears, and I've heard the same complaint from a number of others. As a consequence they don't seal, and the ANR then wows. Sucko.
The Lightspeeds are okay for the money, but their passive qualities are not that great. I'm a believer that you should start with a headset that is very good passively, and then add ANR, not just build an ANR device. The Lightspeeds are the latter.
Now, I have heard NUMEROUS reports, but have no first hand information that the Telex 50 ANR is now the super hot ticket, headset-wise. They are heavy, which I can deal with IF they do their job, which is block noise. I'm told by a number of reliable types that they are the best on the market right now.
MTV