Already have a Xonar DG and an iPhone 4S. I think both have pretty decent DACing capability, but I'm afraid that when I get the HE-400 they wont be enough. The FiiO E17, FiiO E12, Schiit Magni, and the Objective 2 stand out to me. I just want the best sound, if my Xonar DG has a good enough DAC then it'll probably be between the E12, Magni and the O2. What do you guys think?