Sennheiser
there is a new model sennheiser ANR headset out that look to be much improved mechanically over the old ones and similar to the Bose with a much reduced price at <£400 in the UK. I am considering replacing my DC passive set with one of these.
But I do agree with earlier comments that you need to try out the active aspect before deciding. I found a considerable difference over a range of domestic type sets when I was looking for one to use when travelling freight.
I have tried the Bose and found them good but baulked at the £600 (recently reduced too) price tag and even $1000 in the US. But I expect the prices wil drop further if the Sennheiser proves to offer the same level of active
performance