Inexpensive DAC: Schiit Modi 3 or Topping D30

both are ok.  if its just temporary who cares?  differences would be trivial

I personally love the sound of the Modi 3.
There is just something very enjoyable and relaxing about it’s presentation.  I like the sound of the AKM 4490 DAC chip and this implementation just nailed it IMHO. 
Interesting quote from a Hegel engineer regarding this same chip

In their H120 integrated -

  “We have fitted an AKM AK4490 because we think this company makes the best sounding DAC chips – no more, no less. It’s true that they can be a bit more difficult to implement than ESS for example, but the ceiling of performance is so much higher…”

Of course YMMV.

The new Topping E30 at  $130 uses the AK4493, either one would be fine. 

+1 for Topping E30 - it bests D30 in measurements and costs only $30 more. It also has remote, volume control mode or DAC-only mode (fixed volume), input-sensing auto on/off. D30 uses Cirrus chip, where E30 uses AK4493 (better chipset) - as @djones51 said above.

All this makes it more usable for other purposes (computer desk, office, etc) when your units comes back from repair. 

I had a Topping D90 - which gets fantastic test measurements and uses the latest AK4499 chip. However I didn’t like the sound in my system so I sent it back. I suspect the Modi 3 will sound nicer than the Topping E30, whatever chip they are using, based on better implementation by Schiit.