Quote: I saw this, and it is a cool design but I would like something smaller.  Also I have a 4S and that version isn't out yet.

Quote: I do appreciate the smaller size, but I'm not willing to spend the money for a Mustang P51.  Anything else that is this small and will fit my needs better then the E6?  I would like to keep it under $100 if possible.

I'm upgrading my IEM from UE SuperFi 5 to a pair of Shure SE425.  My search for higher music quality from my Iphone lead me to wanting some form of amp to further improve the sound quality.   My question is, which one?  I'm lost.  I listen to music 5-7 hours a day, in a typical office.  I...