I have the Rotel RA-1570 (120w/ch)
and I think it is a very good amp, and if you can get a deal on it, so much the better. Despite Internet rumors, I find it a generally mellow amp, not the least bit harsh or bright.
Any brightness in this video comes from the Camera not the speakers or amp -
I don't think you would have a problem with the Cambridge CXA80 (80w/ch)
unless your room is also exceptionally bright, which would be a problem with any amp.
While the NAD 326 (50w/ch)
is a good amp, the power is relatively low and I won't put it in a class with the other amps.
are good, but from memory are very minimalist amps. Though the Hegel H80
does have Optical, Coaxial, and USB input, plus 75w/ch.
Same with Arcam, and that particular Arcam FMJ A19
does not have a lot of power, about 50w/ch. If I'm spending serious money, then I want some serious power. Also, the Arcam would fall into the Minimalist category.
make very good amps, though you didn't indicate the specific model or the price. It depends on the model, the cost, and the power, but overall good amps.
Again, you didn't give us the prices, but assuming similar prices, the Rotel RA-1570
offers the most features and the most power while still being regarded as a quality amp. And since I have one, that is the direction I would lean. Though again, it depends on the specific price of each amp.
I paid about $1500 for my Rotel RA-1570,
but $1600 is closer to the common selling price, and the new replacement RA-1572
runs about $1700 -