Nothing beats the Sennheiser HD-280 as an awesome pair of hacker headphones. For ~$80 you get terrific sounds, great noise reduction and amazing comfort. I've tried previous iterations of the Bose QC line but I was disappointed by a) the battery requirement, b) the sound quality (poor and muddled by active noise cancellation) and c) the build quality---my pair died after a year and those things never did anything but…
The HD-280's are great headphones, but the HD-380's are a significant upgrade. Better bass response and more open sounding. They sound extremely similar to my HD-595's.
Very good reviews online but a bit hard to get in shops (UK), most places seem to order them in.