Hey, I need some help finding decent closed-headphones. These will be my first closed phones but I do own Sennheiser HD 555 and like the sound of them. However, since they are open I don't use them very often as I mostly listen when in public spaces or when someone is close to me. I listen to a lot of electronic music, drum 'n bass, dubstep and trip-hop but also other genres like modern and classic rock. I exclusively listen to music from my MacBook Pro 2011 and my HTC Hero HD Android phone. My budget is around £100. I might look into getting a headphone amp in the future. Thanks a lot!