What would you folks install for a whole-home audio system these days? I'm using Chromecast/Chromecast Audio but that's because all my walls are closed up and I'm cheap. What would you recommend for new construction? I've seen a few systems with wall-mounted keypads, but they all seem pretty out of date, only allow for volume control from the keypad, and have limited playback controls.

A while back, I set my mother up with a Sonos system. She has speakers in four rooms of her house, so I used a Connect:Amp to drive all of them for a single zone. That's because those things are super expensive. It seems silly to install speakers all over a house, then hook up four Connect:Amps in the network closet, sitting on top of each other. What's the better solution, particularly with streaming audio services?
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Matt