Another couple of suggestion (and my son does enjoy them, nut me not nearly as much, I still have a hard time watching anime for some reason):

Gundam (and there are various versions of Gundam)
Robotech (an older anime, though I think they just released a new movie with the last 2 or 3 years)
Voltron (my son's absolute 2nd favorite cartoon, Transformers neimg the first)

__________________
To those that understand, I extend my hand. To the doubtful I demand, take me as I am!