Why is it that when someone asks about modding the car, every single time its the same list of parts.... Heres my advice, think outside of the box.
Heres what I'd do:
Upgraded suspension
Automatic transmission reprogramming, in essence, its an automatic, but works more like a manual. Theres no protection for overrevving after that, theres no protection for low gears. You put it from 2 to L and you bust something...
Full turbo prepping for the engine, meaning ditching the factory computer etc
T4/T3 hybrid turbo
N2o gets expensive after a while....