if you are planning on just upgrading the supercharger and sticking with it. go for the intake/header/exhaust setup before doing anything. you will need all of this stuff when it comes time for psi-fi pulley upgrade. you CAN NOT just do a pulley upgrade on your redline without doing other things and the ecu. if you are going to go nuts and wait for either a full turbo conversion or a twincharger setup then maybe hold off on doing to much at all because everyhting except the intake you will do now will be discarded later leaving you with spare parts and nothing to do except trying to sell them.
decide for yourself, basic hp upgrades or insane upgrades?? how much are you planning on investing?? the pulley kit seems to be around 800$ or so plus exhaust , intake and header.
maybe suspension?? springs, clutch etc... also very important mods needed later on.
now you have knowledge as they say knowing is half the battle