Better Fantasy back up? Donnie Avery, Chris Chambers, Troy Williamson, or Earl Bennet?

Well I was just wondering who everyone else would pick as a deep receiver back up. Who has the most potential to do the best this season out of the bunch. Meachum on the Saints has been looking good as well as Troy Williamson blowing up pre season. Jay Cutler has played with Earl Bennet before may be a top guy in Chicago? Or old faithful Chris Chambers? Donnie Avery is injured?