High Powered Speakers?

Avalon Eidolons and Revel Salons are two such speakers, and both sound best when used with 300-400W/ch amps.
(Although, if the amps are monoblocks, this can be lowered somewhat, due to the increased current).

I will also note that both of these speakers are very highly regarded speakers as well.

Speaker manufacturers often specify a few power ratings of their speakers at least continuous power and peak power. Usually 200W drivers can undergo peaks upto 500W.
Talon Khorus speakers can handle 1000W of peak power and 400W continuous. They will basically best with amps above 400Watts per channel and on loud volume levels.

The Paradigm Studio100 can handle clean 7000watt peaks above 150hz.
Hardclip a 100watt AV receiver into it for 10 minutes and you'll fry the tweeter.

No such thang as having too much clean amplifer power, as long as you're careful with it.
ie: don't playback the telarc digital cannons at full tilt into a set of mini-monitors with a 1000watt Krell.

"Don't playback the telarc digital cannons at full tilt into a set of mini-monitors with a 1000watt Krell."

Ohhh, can't we do that just once? Just to see the fire and smoke? Pleeze? Slappy will let us use his ghetto system...

You can lay the speakers down on their backs and take bets on how high the woofer can launch a tennis ball.
It'll work at least once.
=P