I'm not at all an audiophile, and I don't really know all that much about audio quality, but I've gotten tired of listening to music from my laptop speakers. I already own a decent pair of headphones (in my opinion), but I've learned that I enjoy listening to music without being tied down, so...

Hi there, I'm pretty much a complete noob when it comes to headphone shopping, and sort of music in general, so I've been having trouble deciding which of headphones I should order.   They're the Sennheiser HD201, HD202 II, HD203, and HD205 II.   I currently own the Koss Ur29, and I...