Pacquiao-JMM. Guaranteed to be a war of some sort. Even if it won't be as competitive as the previous fights, it'll still be an entertaining affair - more so than May-Ortiz and Ward-Froch, that's for sure.
I have no doubt that Mayweather is gonna dominate Ortiz. I like Froch, but Ward is gonna school him. I'm not sure about Pacquiao vs Marquez, so that would be my answer.