How much power is to much power?


When is an amp overkill for a speaker? More specifically, I have 91db speakers and I'm considering two SS amps, one 140 watts and the other 200 watts. Are they both too much? Is it too much simply because you're paying for extra power but don't need it, or because it's a detriment to the overall system sound?

Thanks.
128x128jtnicolosi
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?
Post removed 
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?