Keith, I have as similar situation. I have an X.0 and a Ref2 Mk 1 driving Avalon Ascents and I swithch back and forth. I like the 6922 driven ARC better than the 6H30 preamp because it sounds more tube like. I have cxhanged my mind several times as to which is my favorite preamp and I suppose it depends on what I'm listening to. Anyway, enjoy.
Jeff
Jeff