I got myself a set of David Clark 13xl (active noise reduction) when I was doing my cpl training. They are excellent. They cut out noise at the same frequency as the engine noise so you pretty much can't hear the engines. I have found some distortion though when I turn 90 degrees left or right and don't know why this is happening. I also used a friends Bose headsets once and they were really good too. Stay away from cheap headsets!! I did my first 200 hours of flying with a cheaper brand and often found it difficult to understand controllers and other pilots.
