Why not focus on O-Line?
After watching some of the Championship Games, I'm 100% for offensive line. with a good O-Line the Giants can control the game with the run, and Eli will pick apart D's if they have to fear the run with some Play-action. Look at how much time Brady gets, look at how San Fran dominated on the ground. Even Baltimore was impressive that last drive to end the game where NE knew the run was coming but couldn't stop it. Chance Warmack or Johnathan Cooper would be my choice.
New England with an undisputed top 5 QB in the league was second in rushing attempts!