How much power is to much power?

What kind of music do you listen to? How would you descibe your room (dead/live). What furnishings & acoustical treatments do you have? How big is your listening room?

I listen to primarily classical (from piano to orchestral) and rock. My room is a loft, about 700sf with high ceilings and 30 feet of windows, it's definitely a live room. I've a few acoustical treatments, but nothing major (nor do I want more). So 200 watts is not necessarily necessary but it's also not a bad thing? Correct?

While we're waiting for some of Audiogon's more technically astute members to respond, I can tell you that based on my experiences, the 91db specification doesn't tell the whole story when determining amplifier compatibility. Your speakers impedance needs to be taken into consideration too. That information can be hard to get. The manufacturer will probably give you a nominal and minimum resistance value but a plot covering the speaker's entire frequency range would be much more useful. FWIW, my current speakers are rated slightly higher than 91db and I couldn't be happier that I moved up from 70W to 200W amps.

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.