Looking forward to Schiit's end game preamp, Jason. Exactly what I need in my setup!
Even at $4000 for the stack, its already a steal if it competes well with other 'high end' products. No need to cut down on quality parts.
I'm using the GSX Mk II solely as a preamp in my Hifi setup and it sounds really really good, even as a preamp. I've even compared it to an audio research ref 5SE preamp and while the 5SE was better, the GSX compared very favourably irrespective of the price differential.
My only wish for the GSX as a preamp is for a volume bypass function, but then again, the GSX was primarily made to function as a headphone amp and not as a preamp.