It would be well worth it in a lot of ways, however recently, I have been hearing that on a turbocharged car pushing high psi, it is bad, because you need the extra mass on your flywheel, to keep your RPM's up (and to stay under boost, which is vital). This is from my brother. I sort of disagree here, because I believed that it'd still be beneficial, but I don't have a high hp civic like him, so I am unsure.
I have heard nothing but good things about Clutchmasters alum. flywheels..look into them.