Late reply here, but thanks! Appreciate the input.  Have a friend who recommended (and owns) one of these:   http://www.audiophilechina.com/cp-show.asp?C_id=79&S_id2=2&s_id=25

Howdy all,   Brand new to head-fi, and all hi-end audio.  Been doing research as much as possible and decided to purchase (pending) a pair of   Ultrasone Pro 900s.  From what I can tell these are "decent" enough without an amp (i.e. plugged into my iphone / computer / etc.) However I do plan...