What's the best way (setup) to listen to Gigaton?

in The Porch
I have a receiver with a 7 speaker set up in the basement with a DVD player hooked up. Should I buy the CD? Or will there be a good download version (FLAC?)? I'm assuming streaming won't lead to great audio quality. Any tips would be appreciated as I'm not an audiophile. I typically listen to my music in my car through CarPlay or through a bluetooth speaker at home. With three kids under 7, I don't get the chance to sit down by myself and listen to music, but with the current state of affairs, I will likely get that chance.
And if I were to purchase another piece of audio equipment, what would you suggest? Pair of nice headphones, a speaker that can produce Dolby Atmos? I'm not looking to break the bank here, but if there's a way to spend a little bit of money to get a SIGNIFICANT upgrade in audio quality, I'd certainly consider it.
Thanks!
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