Considering you got a 5yo the wii is much better buy
Rather get a Wii.
He is looking for something cheap. The kinect alone, without a 360, is more expensive than the Wii.
Your five year old will become more proficient than you in no time
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+1 Get a second hand Wii, they can be picked up for cheap. New Wii will be out in less than a year then buy that one.