Jim: I heard both hooked up to a MF integrated (what a great piece) about 9 days ago. The Hawks sounded better, much tighter bass, and slightly more 3D. However, I found out later that the Arro were not on beaks and the bass was not filled with sand. In a 12x12 I'd probably save the money by going with the Arro and buy more MF products. The only thing that would concern me is how high of a ceiling.
Enjoy
Enjoy