Fabbe, I really think you need to go to a shop and try a bunch on to see what is most comfortable. When you've narrowed it down, see if you can borrow representative samples from somewhere and take them flying to see if they perform OK.
If you're looking for absolutely the best noise reduction, try the Telex Stratus 50D. Allegedly it has a 50db noise reduction, and I haven't seen any other manufacturer claim anywhere near that. For reference, my DCs are claimed to reduce ambient noise by 24db. A quick search shows the Stratus 50D is available for $719 from an online retailer (you could probably find a better price, I just picked the third retailer link from the Telex site). I can't say if they're comfortable, as I have never found a set to try out, but they are impressive on specification.