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So I'm finally looking to upgrade my E7 to a nonportable DAC/Amp combo unit.  For the past few weeks I've been researching the Audinst HUD-MX1 and it's seemed like a good option.  However, I've recently been linked to the Tubemagic D1 & Zero DAC.  I admittedly have absolutely no experience with tubes, as I listen to a wide variety of music and want as clean and neutral of a signal as possible.  Even so, these other options are both looking good and fit into my budget of ~$200.  My other concern is the different power requirements of my headphones.  I use a Fostex T50RP modified to sound flat, and an AD900.  Could anyone compare these three units or recommend others within my parameters?