At 200x Jupiter will appear to be about the size of a half-dollar held at arms length. Saturn will be about a third that size. Neither image will be very clear except on nights of exceptional seeing. Cold, still nights give the best views. See link for some views I consider very representative of what you could expect to see through an 8" telescope under decent seeing conditions.
http://www.siowl.com/index.html?realview.html