After gears, FLSFCs, offroad midpipe (if that's an option in your region due to emmisions laws and standards), or cat back, think forward about your forced induction install. Its never too early to upgrade your fuel system with a better pump or a Boost a Pump. Its nice to have support mods in place that not only strengthen your existing performance but leaves you ready to easily step up to the next level.
Never a bad idea to have some nice rims and sticky tires. Even in stock form, these cars benefit greatly from added traction.