These things are NOT cheap. But they're out there.
First and foremost, the DAC/amp combo, from the wonderful Mr. Ray Samuels.. Introducing, the
Predator Nice piece of kit right there. No digital toslink input though.. so may not be what we're after. The next one however, looks nice
Then, Google was able to score me:
Core Sound — HeadLine Portable 24/192 DAC, Headphone/Line Amplifier and Source Selector
HeadRoom makes some combo packages
Packaged Systems - HeadRoom - Right Between Your Ears
If you're feeling kind of froggish, you can leap at this:
HeadWize - Project: A Portable DAC with Headphone Amplifier by Andrija Ifkovic
While I'm sure there are more, I'm also sure that you have Google at your disposal as well.
