I'd like it to be Cena, I like the old tradition of the biggest two stars of the shows going head to head.
I think Micheals and Taker already have a legacy of awesome matches from Ground Zero, Hell In A Cell, Royal Rumble 98, Wrestlemania 2009.
There is zero chance it can ever live up to expectations and will only leave a one match too many notion.
I hope it doesn't involve Batista either...