Bose are simply the best. I sold mine because I fly aerobatics now and they won't stay on.
Almost as good is the clarity aloft, which is is brilliant and half the price
http://www.clarityaloft.com/
It really works well and has the advantage that glasses and caps etc don't affect it. It looks slightly strange to begin with but it is brilliant and the noise reduction is better than the Bose.
I also have a David Clarke ANR. Having been a loyal DC customer for over 20 years and always sworn by them, I must say it is not as good as either of the two above. It is very well made but the ANR just isn't as good and is affected by wearing glasses etc which go under the earpieces.