I'd do the suspension and ARBs, they'll make a lot more difference and keep the car flatter & inspire confidence. It'll also help with the road characteristics too.
Brakes - you have the uprated discs & pads, get some good brake fluid and some stainless hoses. The Alcon superkit is an awesome bit of kit and great on track and road.
With ceramics, you'll need some decent cooling, as the heavy weight tends to heat them up quickly (good), but consistent use on track will need them cooled quickly too.