Hi Crom. Ended up with the tried and tested Vitus Combo. While it wouldn't grab your attention straight away, it gives me hours upon hours of listening without fatigue, which is something I really appreciate in an amplifier. The Audionet did give me something to think about, but to me, those amplifiers shine with single ended interconnects. Unfortunately,I'm already in too deep with balanced connections so didn't pursue it further. While I have not heard the current Karan amps, I have heard ASI amps paired with the Martens. Believe they are made by Karan as well? Oodles of power but I found Vitus gave more refinement. Recently I have been intrigued by Pilium amplifiers. In a casual listen (albeit with different speakers) I find it gives both power and refinement in equal measure. Might explore that in a couple of years time, but maybe another option for you to consider? Hope this helps a little!