4: Shinsuke Nakamura
Are these the two most charismatic superstars in the WWE today? Possibly.
He's the main event of NXT today, it's time to let him take on the main event of WWE for the past decade. Nakamura in a recent interview stated his desire to face Cena at Wrestlemania one day. This would allow him to become the first Japanese man to headline Wrestlemania. What better way to introduce yourself to an international audience than to take on the 15-time World Champion.
The face of WWE vs. the face of Japanese wrestling. This would be a bout with worldwide appeal that clashes the two pinnacle cultures of professional wrestling today. That would be the selling point of the feud, the man who has dominated the USA versus the man who embodies wrestling in Japan. The man who was basically the John Cena of Japan faces the man himself, imitator vs. the master.