I have 25mm front and 30mm back, it looks good and so long as you're not massively lowered rubbing won't be an issue either.
Your wheels won't fall off, you won't go into a ditch at every corner, it'll make pretty much zero difference to the car for real world driving and your family won't be eaten by their boxer shorts either or whatever the current anti spacer talk is.
If you want to look like a rollerskate 52mm would be ideal