I use the Pioneer SE-DJ5000 Dj Headphones when I'm DJing...

http://www.amazon.com/Pioneer-SE-DJ5000-Dj-Headphones/dp/B0002DV7ZC/ref=sr_1_3?ie=UTF8&qid=1301434017&sr=8-3

and Bose MIE2 mobile headset for my phone/MP3:

http://www.amazon.com/Bose-326223-0010-Bose%C2%AE-mobile-headset/dp/B003XU6HNS/ref=sr_1_1?ie=UTF8&s=mobile&qid=1301434164&sr=8-1

Happy with both, but I'm really intrigued with the Sennheiser headphones. Might be my next purchase.