cheap optical switching is easy, s-video is not as bad as component. I dont know that much about s-video switchers, but I know that component switchers that are less then about $300 tend to introduce noise. What are you connecting the s-video inputs to? If you are using standard sets (ie not pc or hdtv's) then any cheap switch will probably be fine, if you are connecting to high quality displays then some kind of reciever with svideo to component or hdmi up conversion would be better (and a lot more expensive).