My impression of the Boulder 1060 is that it has a forward treble, which was not my preference. Perhaps the 2000 series is better, but very expensive.
I have personally used the BAT Rex with the Pass XA200.5 and the Karan Acoustics 1200 monoblocks. Each of these is excellent and recommendable. The Pass XA.5 has a harmonic richness that is special. The Karan has a big sound and is very even across the whole spectrum, including the midrange. I am also curious about Gryphon and Vitus, but these are particularly costly.
I have personally used the BAT Rex with the Pass XA200.5 and the Karan Acoustics 1200 monoblocks. Each of these is excellent and recommendable. The Pass XA.5 has a harmonic richness that is special. The Karan has a big sound and is very even across the whole spectrum, including the midrange. I am also curious about Gryphon and Vitus, but these are particularly costly.