The PutS3Object processor currently supports StorageClass of 'Standard' and 'ReducedRedundancy', but not the 2 additional Storage classes which have been released which cost less.
This processor should also provide these new storage classes as an option.
S3 Standard-Infrequent Access (S3 Standard-IA) Storage
S3 One Zone-Infrequent Access (S3 One Zone-IA) Storage
The Reduced Redundancy Class seems to be still available, although appears to be deprecated. I would recommend no change to that as it's not fully retired and AWS appears to be letting this die on the vine.