Klipsch X10 FTW
I have the original Klipsch X10's.
I've never had a pair of in-ear headphones that cancel noise as well as these.
The only complaint I have is that the bass can be a little weak but, considering these are tiny headphones they sound magnificent.
I wouldn't waste money on any audio product that attributed its self to a rapper. You know all that headphone is going to do is boom as much base as possible. As someone who likes my music with other instruments besides percussion I think I'll stick with brands that attribute themselves to high fidelity.