The band decoder is the linchpin in any automation setup. A lot of vendors sell these for a range of prices. For instance, W9XT's band-decoders are not packaged; but, they only cost $20.
You might want to look around on this page to see how people have configured their automated stations:http://www.k8nd.com/Radio/SO2R/K8ND_SO2R.htm
The usefulness of the autotuner depends mostly on how you intend to use it.