I just ordered the Sennheiser Momentums, and from what i read the iPhone5 has an ok output to drive these. Will test as soon as i get them of cource.
I will also use these with my Lenovo laptop as a source, and i thought a DAC/AMP maybe would be nice?
At home I have a Musical Fidelity V-DAC, could that be of some use?
Looking at Vamp Verza, FiiO, Astell&Kern and other products, but I dont want to spend too much.