Try the Shure E2c headphones ($99) They are noise isolating, not cancelling. Having tried both the Bose and the Shure, and I absoluted love the Shure. I work in an office that recently moved to cubicles, it was distracting hearing all the noise and convesations. I put these in and turn on my IPOD and it all just disappears. Sometimes I just put them in and don't turn on any music they cut that much sound out. Shure has other models that are more expensive and perform better.
I would do a commercial for Shure headphones for free, I recommend them that much!
You can tell I like the headphones!