So, after some research, I have decided to buy Sennheiser 650's and the fiio E7/E9 combo as my first delve into audiophile bliss. A big part of the decision was based on the fact that the closest thing I've owned to audiophile cans was the old version of what I think were PX 200's? The on ear phones from sennheiser with the battery powered amp in the cord. They were the greatest set of headphones I ever owned. So I trust sennheiser's quality. Any comments as to alternatives are appreciated. My question about the E7/E9 combo is this: if the E7 is both a DAC and Amp, and the E9 is only an amp, is the purpose of the E9 simply a much higher power amp? I figure I will use the E7 in the gym with iphone, and the combo with the desktop, then possibly just the E9 alone when listening to vinyl.