Ha! Yes, it's quite ironic that my quest for purity makes for a long and complicated route. Yes, I really do feel like the USB power conditioners and timing/jitter corrections that are made before the signal hits the Hugo improves my setup. Lower noise, more rich and saturated sound.
And I do use my iPod straight to Hugo USB, and play any bit rate I want. And that sounds fantastic too. But I prefer to have my complicated purity ; )
That HPA-21 looks pretty sweet, and would probably do the trick. Just not sure it has enough output power to drive the Abyss well. Abyss needs 1 - 4W. HPA-21 looks like it tops out at 1W. But sweet little amp. Wow, it's 15lbs!