And so the next major audiophile engineering challenge is, err, well what?

[jostber]

For me DACs are good, but the inability to handle analogue sources is sometimes a problem given the amps I currently use. A multi input DAC with a few analogue inputs might be useful.

The Furutech Esprit might be getting closer to what you need:

http://www.adl-av.com/products/usbdac/esprit/