B&W will give you a good sound, depending on placement, and room conditions. But no equipment can improve the source material.
The gear, and especially tweaks, are of little consquence until that is maximized. The gear is way less significant, and tweaks are still of little consquence.
Specs for a good amp:
Distortion: <1%
Damping: >20
Watts: what the speakers need
Verify inversion non-inversion in your system
Then pick the gear that looks good in your system, and color coordinate adequate cables from the many there are to choose from.
The rest is primarily phycho-acoustic game playing and hair splitting.