From a DAC perspective, the Mini-i just smokes the E7.. yes, night and day. You can use the Mini-i as a standalone DAC for your M-Stage.. should work rather well. Check out the Heaphonia and Headphonista reviews.. from my experience, they're pretty accurate. (Had the FiiO E7/E9 combo and I much prefer the standalone Mini-i to it.)
Hope this helps.. M
Hope this helps.. M