I can start 3...I have Gore, Turner, McGahee, McLain, Hightower and Deuce.
I am stuck between McLain and McGahee vs. Colts...
If you go by the Homer rule, you bench Turner against the Bears.
And with the Bears D, it actualy often makes a little sense. Here are the five main RBs against the Bears this year:
K. Smith - 8 carries 31 yds
Buckhalter - 16 for 66
Graham - 12 for 16 (Dunn had 5 for 31)
Stewert - 14 for 77
Addai - 12 for 44
You could make a case for starting both McClain and McGahee against the Colts. Here are the RB combos against them this year:
Forte 123, Jones 45
Peterson 160, Taylor 18
Jones-Drew 107, Taylor 121
Slaton 93, Green 47
I, personally would go Gore, McClain and McGahee. But I am an admitted homer. I even benched Adrian Peterson against the Bears last year.
If you decide to start Turner, I would go with McGahee if you consider your scoring system balanced, yardage heavy, or get points per carry; otherwise McClain if you consider the scoring system TD heavy.
Good Luck. (Nice stable of RBs)