to the forums and the Camaro
I would do what my signature says, didn't regret any of those mods, my car drives awesome. BMR has a rear cradle lockout kit for our cars, too, and it does help, but the extent is more incremental than transformative. I have 1LE spec wheels and tires, they made a tangible difference in cornering capability.
Rock guards are a must, especially if you decide to go wider on tires, otherwise you'll find yourself having to embrace those cute white paint chips all over your rockers. Some of those sucker can even get kicked up to the quarter panel. I would consider side skirts, too, for the same reason.
Any plans of interior mods, or do you only care about power and handling?