500$ budget what should I get

Hello, at my local Costco I plan on getting a 65” S90F for $999. What should I spend the $500 I have left on? I don’t know if I should get an Apple TV and then save more for audio system, or just go for an audio system with no Apple TV. Is it worth getting an audio system if your using the tv’s built in ui? I’m just wondering in that price range what I could find, thank you!

Note: it doesn’t have to be Samsung, I’m just looking in a general sense.