The best bet for boxing is going to be Heavyweights. They always bring in the "casual" fans. Your gonna need to 2 huge punchers. Before the UFC became popular I think either Tyson and/or Holyfeild were involved in every single top 10 grossing PPV of all time (until De la Hoya vs. Trinidad broke thru).

Hispanics are the largest group of PPV buying boxing fans. Maybe Arreola could become "Gatti Like" (RIP) and become a huge draw. I bet Chris vs. one of the Klitscho's would do big numbers if they built it up over the next few month.