Dwight Howard, the Ebony Tower of Power-- to be distinguished from Omer Asik, the Ivory Tower of Power.
I actually like Dwightmare. I don't know why that's never been suggested as his nickname in a positive way. As in.. a Dwightmare for opposing teams. It also fits with what should be his power style of play. Olajuwon was the Dream, and Howard is the Dwightmare.
I posted in another thread but it should be The Dwightmare...its perfect. It makes fun of the media as well as plays nice against The Dream.