I bought the Bose QC2s and they come on every flight with me, be it an hour or 11 hours.
I find them very comfortable to wear all the time onboard, even when not using IFE or listening to music. If you move your pillow about into the right place (and depending on how you sleep) you can also get some shuteye very easily with them. Only problem with them is, they either noise cancel or don't work at all. So be prepared to take a stash of AAA's with you on long flights. Also they are a bit flimsy and a friend of mine who flies 150,000 miles a year has his bound up with tape!
I paid UK prices (£285/$545) for them and I'd buy them again!
As for promos they won't reduce the price but they might chuck in a free portable CD
"My first job was selling doors, door to door, that's a tough job innit" - Bill Bailey