If you use headphones a lot, while you’re at work or the gym, I can’t recommend my Sennheiser PX100 headphones enough. They were given to my by my friend John, who made several outrageous claims about their quality.
He was right. These things are phenomenal. I wear headphones about 5 hours per day, and the quality of the sound, paricularly the bass, is nothing short of outstanding. They’re lightweight and comfortable, and they allow a bit of ambient noise in so that no one can talk about me while my back is turned.