Sennheiser PX100

I have a pair of these Sennheiser headphones and find them to be the right balance between fidelity and light weight. For me the ear plug type headphones often filter out too much ambient noise (if you have a family at home that you need to keep an ear out for you'll understand) and I find that I'm constantly fiddling with the plugs to make sure they have a good seal because the fidelity is so poor without a good seal. These are also comfortable for hours.

Sennheiser PX100: "The PX100 is an affordable middle ground between pesky earbuds and chunky headphones.

"

(Via PC Magazine: New Product Reviews.)