My prediction with no information except the political climate of 2015, name recognition and some announcement speeches.
Delegate Count:
Paul Ryan: 542 (Red)
Marco Rubio: 511 (Orange)
Jeb Bush: 371 (Blue)
Nikki Haley: 312 (Green)
John Kasich: 233 (Lite Blue)
Tim Scott: 140 (Dark Orange)
Rand Paul: 130 (Lite Green)
Jim Renacci: 113 (Dark Red)
Rick Santorum: 74 (Dark Green)
George Pataki: 37
If everyone stays in till the convection then it will likely be brokered with the top candidates being Paul Ryan and Marco Rubio with Black Horses being Nikki Haley, Jeb Bush and John Kasich. Most likely a frontrunner will have to choose a black horse to win the nomination so my prediction of a ticket would be something like Rubio/Haley or Rubio/Scott or Rubio/Renacci or Ryan/Kasich or Ryan/Scott.