There is no right answer unfortunately. You can not go wrong with in ceiling speakers. Upfiring speakers is where your mileage may vary. I have been in demos in some rooms where they flipped back and forth between both types and it was VERY hard to tell the difference. In other rooms it was...
You need a three way switch - something like this Lutron Maestro Dimmer Kit:
https://www.amazon.com/dp/B008X3CH70/ref=twister_B06XKQ6LX2?_encoding=UTF8&psc=1