High Powered Speakers?

Rule of thumb: If the speakers can handle 200 watts buy a 400 watt amp and turn it up half way.

Talon Audio has some 1-1000 watt speakers.

Marty

The big U-1, A-1 and M-1 Soundlab speakers can handle 750 to 1000 watts of power according to Dr. West, their creator. I have not had the opportunity to put that large an amplifier on my Soundlabs, but it would be nice to audition.

Marty is right: buy an amp that can handle the toughest of speakers. If you amp has needles, you should be okay if your needles don't exceed 60-70% of the way to the top, 90% of the time. This tells you that the amp is comfortable with your speakers at the volumn that you like.

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.