I've only ever used ear buds, but either my ear canals are weirdly small or I'm just over-sensitive but I find them incredibly uncomfortable and they never stay in. I'm looking for a portable pair of headphones to use to listen to music on my ipod and cellphone while I'm walking around outside. It would be a bonus if they had noise cancellation or were at least thick enough to kind of block out the noise of traffic and people in busy places. I would also like to use them in my school library without having the music leak out and annoy people, so closed with sound isolation would be preferable.
I'm willing to spend up to $200 if the set is perfect and good quality, but I would prefer to spend around $100 seeing as I doubt that I'd notice the difference in sound quality between a decent pair and a really high-quality pair. I've been looking at all the Sennheiser HD400s (449, 429 etc) and they seem OK but then I keep seeing people say they're not all that great. If I had more money I'd go for the Sennheiser Momentums.