Brainwavz HM5 ...superb isolation, though technically not noise cancellation...
good with many genres.. v comfy,,v light on the head.. cheapcheap.
its hardy enough to throw into your napsack..
if u dun mind the size.
On another note here, all of the noise canceling headphones I have tried in your price range cannot even come close to the sound and bass that the red waves can make. Honestly, when you play some music on them, and put them on your ears, you can't even hear yourself clap in front of your face. That. Good. I think you should definitely get them. You won't regret it.