Just a quick bump and another question; would adding a Fiio E5 into the equation be a good fit for the MX 980?

Hey all, I'm heavily considering purchasing Sennheiser MX980's... they are £81 (around $130) on Amazon UK which looks like a really good deal to me. The only thing that's holding me back is that I'm going to be using them straight out of an unamped iPhone 4, and I've heard the 980's need an amp...