Who is the 2008 NFL MVP?

This has been the hardest year to decide for me. All the really worthy players (C. Portis, A.Peterson, D. Brees, Maybe K. Warner) are playing on teams with 7 wins or less...All of the teams doing really well (TEN,PIT,TB,NYG, BAL,CAR) are either relying on their defense or its such a team effort you can't pick one guy). This is really hard for me, but I'd go with either Romo or Portis b/c their teams have played worst when theyre not on the field. Your thoughts?