Just moved into a new home that has built-in speakers which I want to make 4 zones from (Zone 1: 4 ceiling speakers in living room +1 ceiling speaker in kitchen nearby; Zone 2: 2 wall speakers in dining room; Zone 3: 4 speakers on porch; Zone 4: 2 speakers next to porch facing pool). I previously had arc/beam/surround/sub setups in multiple rooms which I will still use for rooms which are not prewired. I've gone back and forth with not using the built ins and adding more sonos speakers, or using multiple sonos amps, or using the sonos port with a sepearate muli zone amp. I want to have full control of which zones are playing at the same time rather than have all on or off. I also would like to be able to control the zones and volume from my phone. Is the best option just to spend the extra money and get individual sonos amps? Would having non-sonos speakers be a good option if the home is already prewired in terms of quality? Any details and tips on actual setup would also be appreciated. Thanks in advance :)