Bose for the win, bought my qc15's about 6 years ago and still going strong.(had to replace the ear cups). Use them for when I fly overseas. Goodbye airplane noise, baby's crying and the arbitrary cabin announcements. As mentioned in thread, get them overseas (amazon), as they are much cheaper there. You can also keep an eye on carbonite.co.za, seen quite a few going for a good price there in the past. Other headphones that rock are senheiser's. but to be honest havent tried the noise cancelling ones. Have a set of HD600's that I use all the time when im not travelling, they are awsome.
