A speaker's "loudness" isn't determined by its' sensitivity; that determines driver efficiency. A speaker with 85 db sensitivity can sound every bit as loud as a speaker with 91 db sensitivity, granted they handle the same amount of power. All it means is that the one with the lower sensitivity isn't using the power from the amp as efficiently, so it makes the amp work harder to reproduce the same volume of sound than it would have to if the driver was more efficient. But asking people on here to suggest which of the 6 is best, when they are ALL shit, leads me to believe you aren't really all that interested in really learning anything. RMS vs. Peak power handling is a joke. RMS is typically the maximum amount of power a speaker be subjected to continuously. Peak power is how much a speaker can theoretically be subjected to in short bursts or for short periods of time. The Boston Acoustics Pro60 woofers I've been using have an RMS power rating of 125w/each. Most people who have used them though, know that they don't really 'wake up' so to speak, until 150-200w. I personally had them seeing ~220w/woofer, and they took every bit of it. I realize they weren't seeing a constant 220w/channel, but they were seeing more than 125. Now on the other hand, expose some sick *** Boss or Pyramid components to the same power, even though they have the same power rating, I can almost guarantee they won't last 20 minutes. The individual components they use are not near the quality of say a Boston, Alpine Type X, Hertz, Focal, etc. They can rate them at whatever they want, but when push comes to shove, the cheap stuff will not stand the test of time. How was that for 2 cliches in one sentence??? //content.invisioncic.com/y282845/emoticons/biggrin.gif.d71a5d36fcbab170f2364c9f2e3946cb.gif
Anyway, you probably aren't interested in all this as it will take some time to run through your 'Retard-to-English' online translator, so here are the cliff notes:
Boss, Pyramid, Audiobahn, and the other brands you listed, ****. Don't waste your time perusing through the power ratings and efficiencies. They ****.