Quick question re: Internet Speed need.

For our new house, what speed of internet should I buy from Xfinity? I can do a gig but it’s pricey - If I can do streaming TV and basic work bullshit with 400K it’s a ton cheaper. I’ll only have 10 channels at the new place as I’ll use a smart TV and Amazon/Netflix/etc for streaming entertainment (not a priority).

What is the optimal for streaming TV where I won’t have to worry about buffering bullshit?