How is buying 5 large pizzas going to lead to any positive educational benefit? I think it will just lead to larger stomachs and life-long struggles with weight.
I don't buy the music argument being negative. Music appreciation is a positive thing.
For the video games, Kits-->Kids, spent-->spend. The "nothing relevant to the real world" is a bit overblown. Some recent studies have shown that they do learn something (problem solving, co-operation/socialization in multiplayer modes, as depressing as that is, etc.)
Arduino: spent-->spend.
Parents are REALLY sensitive to what their kids' teachers publish. I'd vet this through a couple more teachers before putting it out there.
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The Gadget Shield: accelerometer, RGB LED, IR transmit/receive, speaker, microphone, light sensor, potentiometer, pushbuttons