Keeper League Help..?

I'm having some trouble deciding on which three players i should keep for this upcoming year. I know there are two that I'm definitely going to keep and they are Calvin Johnson and Dallas Clark but the last player I cant decide. At first it was a toss up between Ryan Grant and Matt Forte but now that T.O. signed with Cincy I'm thinking of keeping Carson Palmer. So just let me know what you think and/or if I should keep someone else besides the ones I said. Also here's my full roster of the players i have abalible to choose from: Ben Roethlisberger, Ryan Grant, Matt Forte, Santonio Holmes, Calvin Johnson, Dallas Clark, Jason Campbell, Carson Palmer, Chris Chambers, Antonio Bryant.