I had Bryston 4B-st, but I did not like its misty, almost mechanical sound-especially the bass which lacks definition, albeit powerful (one note bass). I also found it to be quite two dimensional sounding lacking dynamics and speed in the midrange. I also tried the Bel Canto Evo and felt it even to be more mechanical and less dimensional than the Bryston (like the soul of the music had been sucked out).
I have not heard the Aragon so I cannot comment on it.
I ended up keeping a Marsh A-400 to drive my Magnepan 1.6s, which is more transparent, has more finesse, and better bass definition than the Bryston. If you do not need a lot of power the Rogue 120 would be the best overall choice, even better than the Marsh, more dynamics, dimensionality, purity and transparency.