Watts RMSis the only number that counts, both for Amplifiers and Speaker systems.

"Peak" or "Music" rms figures are usually at least twice as high as RMS (sometimes more) and can usually be re-interpreted as "meaningless".

Another trick for speakers is to quote the total "music" power for a pair - so a pair of speakers quoted at "1000 Watts" might turn out to be 250 Watts RMS.

For truly meaningless figures, look at the specifications of some of the computer "Multimedia" systems. I've seen a pair of 5 Watt RMS speakers advertised as "200W Peak". mmm.

You can also get some very optimistic figures for speakers aimed at the Car market. My local spares palace sell "300W" 10 inch "car stereo" speakers. Judging by the magnet size they are about 80W RMS on a good day.