I'm currently using a R-Pi with Moode into an HRT Music Streamer II+ DAC via a Chord Silver Plus USB cable. The Pi is powered with an iFi iPower PSU and this also powers the DAC.
Now looking at an improved method of powering the DAC. I briefly owned an Aqvox PSU but passed this on recently as I thought I was going to have a change of direction, but have decided not to.
My thoughts are-

Aqvox PSU.
Another iFi iPower with a conduit cable from Audiophonics.
Anker battery with the Audiophonics cable (this could power Pi and DAC)

Any pointers greatly appreciated!