That Monoprice dac amp combo looks amazing aesthetically. It has problems though. I hope K7 will measure much better. As i said earlier you can get godlike performance with E30+L30 stack $260 free shipping, Schiit/Atom stacks. For $500, you should be close to it's performance(i know you can't beat it). You also need real balanced output, additional features and premium look.
2x 4497 or 2x4493 per channel
THX amp with performance around Heresy, L30 or Atom (with more power)
Equally good single and balanced output.
No flaws (jitter, imd, tone, linearity, channel balance, output impedance, dynamic range, noise, distortion, noise free sensitive headphone drive etc)
Possibly MQA and Dirac, maybe equalizer