How much power is to much power?

Very difficult to have 'too much power'....But why bother?
You have fairly hi sensitivity speakers. 50 or 60 hi-quality watts should do the trick, unless you want to induce ear bleeds.

Newbee says::
FWIW, if you've got the money, and you are not giving up sound quality, having high power reserves in not a bad thing. But high power high quality amps cost a disproportionate amount of money for the power you get but don't use.

Exactly my point. With reasonably sensitive speakers, you simply have little need for mega power. Sure, I'd love a pair of Mac monoblocs or a pair of BelCanto Ref1000's.....a full kilowatt each into my Maggies, but why bother? With my Maggies at what....? 85db, I'd need 4x the power for the same result as Jtnicolosi with his 91db speakers.

Take the difference in money, and buy some more music and maybe work on the room.

A SET amp may not control a woofer at higher SPLs but that has little or nothing to do with damping, which is a function of an amps low output impedence.
TEST:: take a bare driver...woofer prefered. Thump it with your finger. Rings nicely, right?
Now, take a short piece of wire and short out the connections. Thump it again with your finger. Little or no sound, right?
The woofer basically damps itself when its 'load'...the output of the amp, has low enough impedence. The rest goes up as heat.
As for control, doesn't audible distortion play into this? If you had a dual trace scope connected and could compare the input signal and the actual speaker motions, you could visualize it. the traces match?=good 'control'.
Traces don't match? Bad control.

Yep:Vett93, that was the point.
Now, extend the model to include speaker 'Q'.....