Thanks for the welcome.
A USB input is a good feature, and I also use a computer for my media server so I can really understand the desire. It certainly makes a lot of sense for people who use headphones at their computer.

Unfortunately there's no USB input right now. As josep mentioned, there are a number of USB->S/PDIF converters available for very reasonable prices, but I know that will be an inconvenience for some.
Perhaps more unfortunately, the D100 is only UL certified for sale in the United States and Canada right now. I am hoping to extend to the rest of the world soon. The unit as-is will work with 230V/50Hz--you just need to attach an appropriate power cable.