My ideal setup would be a digital mixer, I like the Allen & heath qu series, with powered speakers and monitors and digital snakes. The digital snakes can eliminate a ton of noise from less than ideal rooms. A nice feature that could be added later could be an analog snake from somewhere on the stage back to the sound booth as well as a few pairs of cat5 or cat6. These would be for if a band wanted to use their own mixer. The analog snake can let them patch their board right next to the house board and just hand them a stereo pair or having the data cable for their digital snakes.