I'd probably go with Walker at Indy. After the way Grossman looked against AZ, I would give him and their offense this week to see if they are really legit. Plus Indy's secondary is banged up.
Indy is much more easier to run against, so I would go with Berrian, though if Indy gets a huge lead, which is possible, Plummer will throw the ball a ton. So if you think Indy will score a ton of unanswered pts than goin with walker, if not go with Berrian