A stage 1 map was the best thing I ever did to my car. IMO a cat back exhaust is pointless as all it adds is a little noise, each to their own I suppose.
If I was you, get a stage 1 remap from a well regarded tuner and see how you feel from there, I think you will be so involved with the extra power and drivability you won't miss a exhaust or down pipe....well for a few months then you will be looking for more power