Welcome @Scottishhammer I also have 16" and 23" and it is a great combo. I agree with basket splitter, rotisserie, cover, and stone. I don't have the cold smoker...yet. Whatever you decide on you can't go wrong.
@Flemming nice video! Looks great in it's new home. Nothing better than moving a new KK around with heavy equipment!! How much time passed from the time you took delivery at the dock till the time you put the cover on at the end of the video?