Have a look
here.
The Pro.DAC might be small, but it plays with the big boys. This tiny four-ounce DAC puts out a big, dynamic and detailed sound.
The Pro.DAC uses the CS8416 for the receiver chip and the highly resolving 24-192kHz CS4398 for Digital-to-Analog duties. Dual LT1364C Op-Amps are used for analog output.
In addition to the USB input, the Pro.DAC also has Optical and RCA Coaxial digital inputs. Analog output is via standard RCA plugs.
Inputs - Toslink Optical, RCA Coaxial and USB.
DAC Chip - Cirrus Logic CS4398
Receiver Chip - Cirrus Logic CS8416
Only $160 AU and they are just up the road from me.
30-Day Trial Period so I might pop in and see what they are like.