Saw The Three Tenors outdoors in Detroit 2 years ago, an all-Meyer system, sounded great. Turbosound has some pretty powerful boxes, the Flashlight and Floodlight series. I guy I know who uses Turbosound is raving about Funktion One speakers, from the guy who developed Turbosound. Check out their website at funktion-one.com. Also check out audiodirectory.nl for some more interesting pro audio manufacturers.

All the big names have web sites which pitch their particular solution and are pretty interesting. Certain truths in sound reinforcement have cropped up over the years, and are usually based on solid physics.