Using an amp is a personal preference, I use a 5 channel 200wpc to drive my fronts and surrounds and let my Denon drive the rears. The 80's like more power but it's not necessary. A suggestion would be to go with something like the 3806 and get a higher watt 2 channel amp to drive the 80's. Either way you go the system will sound great.

A computer once beat me at chess, but it was no match for me at kick boxing.