A few questions before someone can answer intelligently.
1. How/where is the car driven. Track driven, occassionally track driven, or just on the streets?
2. Can you lock up the brakes now?
If the answer to the first one includes some track time, then there MAY be benefit to some brake upgrades such as less brake fade in larger brakes.
However, if you can lock up the brakes now, you have more brakes than your tires know what to do with.
Tires stop the car, so typically the best brake upgrade is the stickiest set of tires you can run.
Of course, I hear big brakes look cool, but I've never been into cool.
FWIW,
TB