- Pi 3 SBC
- PiTouch 7" touchscreen
- SmartiPi stand
- Pi2AES audio shield
- Power supply for Pi2AES
- Pi 2 Design supplies (5) with a straight barrel adapter that is too long for the stand (3), but this elbow adapter fits (thanks to Michael Kelly @ Pi 2 Design).
- Whatever miniUSB 5V power supply you have around to power the PiTouch (I'm using an otherwise idle Chromecast power supply)
- moOde Audio Linux-based digital music software
For those of you who have USB DACs or integrated amps, I've heard good things about the Allo USBridge Signature, which can also be bought as a complete box with a Pi and pre-installed software.
I've used quite a few more expensive transports in different configurations, with different DACs and downstream audio chains. Pi2AES is definitely competitive with many times more expensive transports, if you are willing to do the hardware and software legwork, and I suspect Allo USBridge Signature will be too.
Pictures of the Pi2AES-based transport feeding a nice Soekris dac1541 sign-magnitude R-2R DAC from Denmark followed by the now discontinued HP-1 headphone amp from Neurochrome in Canada.