The Horus is 6-slot modular system with as many A/D and D/A configurations as it can hold. It's performance in PCM is very good. Not quite up to the Trinity/MSB, but I'd say equal to the Playback and older Lampi. I haven't heard the new Lampi R2R PCM yet.
You should do it soon! I am still choosing which GG version to buy and expert opinions are very welcome.