I haven't seen much talk about separate video switching devices to know what's best, but I did a quick Google search and turned up
a JVC JS-X111 switchbox that would seem to do what you are talking about.
As some others may point out, the best bet (when possible) is to go directly from source (DVD, HDTV decoder, etc) to display. That requires that the TV has enough inputs, which since you're looking for switching may not be the case...
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