Bose lead the way in sound quality, portability and erection/breakdown time. Depending on the size of your gigs, check out the Bose L1 compact, or the L1 model 2. I have been using mine for over two years and it is the single most impressive piece of kit that I have
ever owned during a lifetime of buying and using all manner of high end guitars, guitar amps and PA systems. In short, it does not sound like a PA, it is extremely pure, like a loud, hi quality hi-fi system. And the throw is 190 degrees (Yup, 190 degrees) as opposed to the narrow beam of 'punchy', coloured sound often put out by conventional 'boxed' speaker systems.
Just go to a store and try one. But take your money, cos you will buy it.