oh, let's see...
Peyton obviously, but to me, Edge has been the thing the Colts have relied upon, and set Peyton and the WR's up to do what they've done the 2nd half of the season so far...plus the Defense was so strong early...
Shaun Alexander...very viable candidate....
LT...same as above.
Tikki Barber? long shot maybe??
Steve Smith, no one has accounted for more offense on one team than him this year, but limited touches per game would probably limit him, but monster year from the little guy.
the entire Bears' Defense?
Carson Palmer, if they win the AFC North...eveyone likes a worst to first story.
so short list:
Peyton
Edge
Carson
LT
Shaun