I currently own a pair of Shure's E2C and Klipsch Custom 1.

However I have not been too impressed with my current set of headphones and have drawn up a shortlist for my next investment.
  • Shure Se420
  • Shure Se310
  • Sennheiser IE 6
  • Sennheiser IE 7

Regarding the Sennheiser line-up I find it confusing if they are single or multi drives so if anybody can clear it up that would be good.