The Nike Romaleo's fit a wider foot. Any of the Adidas fit a narrower (C width) foot.
The Adidas Adipower have a heel lift differential of 5/8" inch. The Adidas Power Perfect 2 have a heel lift differential of 1",
thus putting your knees in a farther forward position.
The Nike Romaleos have a heel differential of 3/4".
Try em on before you buy, if you can.
Oh, and the Adidas tend to fit about 1/2 size long.
So I went from a 12 down to an 11.5