Yes a remap is a good investment, but it depends on what else you plan to do.
If you plan to do, Exhaust, inlets etc some time in the near future a remap should come last.
But if you dont plan any other mods get it done.
The RStuner generic map is as good as anything for a standard car but if you have mods i would suggest going to either Tour-De-Force (TDF) and seeing Matt or Going to RStuning and seeing Paul for a custom map done on the rollers.