I bought a GG1 and upgraded to 11P, now it's a matter of when not if I send it back for 12X2. The sound is to me glorious now, and the reviews of 12X2 are that it brings the GG3 to a new level.
I heard the Aphrodite and will shamefully admit I prefer the GG3, there is something about the DHT sound that connects with me vs the fast articulate Aphrodite. I know the Aphrodite is a far superior DAC but it doesn't speak to me.
I think the Horizon (or Aphrodite) will sound more like your Swiss Nagra Tube unless you are looking for a more lush sound.
Good luck, I can't wait to hear about the next stop in your journey.

