Added power does not necessarily translate into a sonic improvement, so I can't say if you would hear any benefit from going from the 7100 to a 770 or monoblocks. I'm not familiar enough with your speakers to know how they behave with different amps, but 165W at 4 ohms is a pretty respectable reserve of power. Monoblocks could offer a little benefit simply by the nature of giving each amp channel its own power supply.