Peltor or Sennheiser
I have a few thousand hours flying Islanders (very noisy) and would thouroughly reccomend either the Peltor 8006 or the Sennheiser HMEC 100. I have occasionally worn DC's but never found them comfortable. I have worn the other two types for up to six hours at a time and they have always been comfortable. They are also much cheaper than DC's although not what you might call budget. If you want to go one step further later on then the best on the market is the Sennheiser ANR models. Every bit as good as a Bose. In something like the Islander they are in fact better. Hope this helps.