I should have clarified my reference to 'power' in that I'm not looking for cleaner AC power but whether my 150 WPC Nova 150, for example, is a better amp/integrated solution than say an amp/integrated that is rated at a lower WPC but has room correction built-in.
Yes, you should have been a lot more clear.
Now the answer is easy. Anything with room correction, don't even consider it.
The one thing you are onto is that a lower powered amp might well be better. The guiding principle was best stated by the great Robert Harley many years ago, "If the first watt isn't any good, why would you want 200 more of them?"