I am trying to build a 2nd system around my Memento.
I have tried several amps in the past few months including:
Pass INT-30A. Musical and warm. Maybe it's not broken in, it doesn't have quite the extensions on both ends. Details are there, but not apparent like some amps.
Spectron Musician III SE. Very detail, fast, transparent, and dynamic, a blast to listen to. Slightly on the lean side of spectrum.
Musical Fidelity Tri-Vista 300. Powerful, musical, but somewhere roll off sounding, not in the same league with big boys when it comes to transparency and extension.
McIntosh MC501. Just sounded veil to me.
Atma Sphere MP60. Great transparency, but lacks PRAT. Doesn't have quite the authority of BAT 75SE in bass and image lacks weight as well.
BAT 75SE/150SE. Just wonderful, has everything I seek for. Musicality, liquidity, extension, bass slam, dynamic, sharp focus, image weight, transparency, and on and on. I use 150SE in my main system, just picked up another 75SE for my Memento.
Not to bad mouth ARC, but you should proceed with caution with ARC newer gears. I had Ref 3 in my system for a week and tried both Aerial 20T & Memento, the famous "whitish" sound was apparent since first note. I think it has something to do with 6H30 implementation in their circuits, BAT & Conrad Johnson do not have that sound.
I have also owned many amps over the years, just a short list below:
Rowland 8Ti HC, a bit slow sounding and rolled off when compared to newer offering
McCormack DNA2 Deluxe, a bit unrefined sounding, but has PRAT
Pass X350, too lean and therefore not engaging
Sonic Frontiers Power 1/2/2SE/3, good bang for the buck
ARC VT-100 Mk 1/2/3, I will take SF amp over ARC any time
Have fun shopping, I am also shopping for pre amp to go with my 75SE, most likely a BAT 51SE or 32SE.