HDTV Input lag question

im planning on buying an led hdtv for my xbox 360.
But will there be input lag? the hdtv supports 720/1080i/1080p and so does the xbox 360, so there is no input lag, correct?

in other words, can you confirm this?
"Modern game consoles such as the 360 or PS3 don't have this problem since they are all natively HDTV ready supporting 720p, however games in 480i need to be scaled up to 720p and the rendered on the TV, during this can cause a delay, and thus what you control can have a delay on reaction times, such as your character moving a split second later then the actual input itself. This is why there is Game Mode included on certain models of HDTV, to reduce this input lag."

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