Who to start at RB/Flex?

[tjwashga]

I have an open spot for RB and flex and my choices are...
Jonathan Stewart (vs. TB)
Jahvid Best (vs. PHI)
Austin Collie (vs. NYG)
Jeremy Maclin (@ DET)

Peyton Manning is my QB if it helps Collie's case.
I want to start Stewart despite his week 1 performance. Best had two TDs week 1, but didn't get much yardage and will be facing the tough Philly D. Collie had a big week 1, but is facing a better D than Maclin who also had a good week 1.

[Bigpop]

My gut reaction is Stewart is the surest thing and the other 3 is just a roll of the dice. Maybe someone can shed more light on them, but I like Stewart because Car should be on it early and run the ball late to kill the clock on TB.

[tjwashga]

I'd like to here some more opinions.
Thanks