4. Dean Ambrose vs Bray Wyatt
WWEThe prospect alone of these two going back and forth on the mic in a build up to a PPV match is incredibly exciting: each man trying to out-crazy the other would make for an incredible feud. In contrast to several of the other suggestions here providing several weeks of solid athletic competition, this one is best served built entirely on the phenomenal character work the two are capable of. This is WWE's version of The Scarecrow vs The Joker: Wyatt is a long term maniacal schemer whereas you get the feeling that Ambrose doesn't even plan to wake up tomorrow morning. The idea of watching the Lunatic Fringe surge and struggle against the Family's muscle whilst a mocking Bray haunts Ambrose from just beyond his grasp would make for the best segments of Monday Night Raw every week. The satisfaction the fans would get when Ambrose finally gets his hands on Bray come PPV time would then be a fantastic payoff to the awesome build. This is a good feud for Ambrose once he is done with Seth Rollins, maybe a good one to head into the Royal Rumble in January.