FWIW, there's also Snap Circuits: http://www.snapcircuits.net/ http://www.snapcircuits.net/ I had this one as a kid, and I had fun with it, but I don't know how

FWIW, there's also Snap Circuits: http://www.snapcircuits.net/ http://www.snapcircuits.net/ I had this one as a kid, and I had fun with it, but I don't know how it compares to the other electronic kits you listed.