BigAir
I use a 10-15yr old DC H10-80 in a 146 (5yrs) and DH8 (5yrs) before that.
The Telex sets the co. provide are not noise attenuating at all, and after early years in pistons with no hearing protection I miss too much on the radio without it (noise attenuation).
I'm currently investigating a replacement, the front runners are the Bose Aviation X and Sennheiser HMEC 300 or 400.