Just to get things straight, as pikcachu said, the standard brakes on the M235 (blue calipers are standard with blank discs) are the same calipers you get on the M Performance option, just different colors. The discs themselves I haven't been able to verify that they are any larger in diameter, they do have dimples and slots which may help dissipate heat, but I doubt it will do much.
On the other hand, the Brembo kit is indeed an upgrade, but whether it is worth it is again hard to say. You do not have the car yet, I assume. I'm not a track junkie, but most that I know go through parts like crazy people. I would say the most prudent thing is to learn the car, its limits and shortcomings and go from there. Spending money for the sake of spending money is not really in my vocabulary.
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