Another SS you should consider, though you would have to buy it used is First Watt (Pass) Aleph J or the F4 model. Can't say you will like it better than your Atma-Spheres, but I find them very, very enjoyable with my Merlins and my other amp is a CAT JL2 - so in that company the Aleph J is formidable given the price (used 1,600-1,800)and given an efficient and benign speaker impedance - mostly over 8ohms and linear.
