shady, even $300 Denons will drive 80's to very loud, clear levels.
Pat, amplifiers amplify, that is it, they don't magically make the music sound better. The room characteristics and speakers would play a much bigger role in affecting the sound.
The advantage of having gobs of power may help at very high listening levels where extra headroom may be needed. However, most people would never listen at these levels in normal room sizes, and even a 100-120 watt receiver is more than enough to cover 15-20dB jumps.
Keep in mind, your Axioms only require a few watts to play very loud in most rooms.