They do include a lightweight flywheel (SMF: Single Mass Flywheel, same thing) so would be worth doing. I would only bother with the Stage 1 though, unless you are 100% sure of going FI down the line. If not, then stick with the most OEM-like option available. I ran the Exedy kit on my old car, and that saw plenty of track use too and it never left me feeling like I needed something stronger. In comparison, my old MR2 mk3 that I turbocharged was running an Ogura ceramic jobby that would take like a billion bhp: Now this meant you could happily flat-shift at WOT, but man it was an utter PITA on the road (although it was still something you could live with, if you were a narcissist like me). So no, I'd never go for something like that ever again.
Worth doing though