I'm toying with getting some M3's for the kids to replace their All in One rubbish iPhone docks but I'm stumped on who offers an small and reasonably priced amp designed for an iPhone. I like the look of this Headphone Amp as an example (but it will not drive M3's of course). http://www.bhphotovideo.com/c/product/809824-REG/Fiio_E9I_E9i_Desktop_Headphone_Amplifier.html

I'm not the iPhone type so any suggestions would be great.
HT:M80s,VP150,QS8,EP500 Outside:2 Pair M3 1 Pair M22 Office:AudioBytes, Games Room: M60,VP150