I'd never go back to a avr for the main system.
If your room /speakers requires a power amplifier, and a sub, both.
I'd never go back to a avr for the main system.
Same.
You could do. Anything from three channel for fronts or whole lot.
I'm using ATI 2000 series, 7 channels. 200w into 8 ohm, 300w into 4 ohm. All channels driven