Noone has mentioned the JBL EON's yet which I have found to be extremely reliable and solid. They are in use everywhere. Not cheap but they seem to be built very well and they sound great.

FYI: I recently has a bad experience with the Mackie powered speakers. I was working in a club that had a pair of these sitting sideways on shelves on the stage floor as monitors, and I was using them at low power when one of them overheated and shut down on me. It turns out that if you block the heat vent fins on the back of the powered Mackies from air circulation, and especially if they are turned sideways, the Mackies will do a thermal lockout even at low volume. The fins were almost too hot to touch. It took twenty minutes on a fan to bring it back to life. Even though the Mackies have a molded "dent" on one side so you can use them as stage monitors, the fins are mounted vertically so heat cannot dissipate properly unless these speakers are used upright and on speaker stands. I think this is a poor design and a possible fire hazard.

The JBL EON's do not have external heat vent fins so they can be used anywhere regardless of air circulation. They could be used in the same monitor position as the Mackies were in my situation without any problem. I've read in other groups about people having the same experience with Mackie powered speakers doing thermal shutdowns.

I don't know if the other brands of powered speakers have heat fins on the back like Mackies but it's worth keeping in mind that some of these powered speakers require more air circulation than others.