#3 Carmella
Carmella has made quite the impression since coming up to the main roster with her heel persona working out better than anyone could have anticipated. The Princess of Staten Island has carved a strong character for herself that has gotten over well with the crowd, and her recent partnership with James Ellsworth has made her look all the more intelligent.
Right now she doesn't feel like someone who could actually hold onto the championship, but she'd be a formidable challenger in the months between SummerSlam and Survivor Series when WWE typically hits a bit of a lull. She's entertaining, she's diverse and a loss really wouldn't hurt her all too much considering she's still in the infancy of her career. It's a no-brainer.
The next man is quite simply - awesome.