DBA and Zimmerman are both respected after market producers, so you probably won't notice much difference in performance unless you are doing very serious track work.
When talking calipers, brake pads and rotors the law of diminishing returns hits pretty quickly. You'll find that tyres will make the biggest difference to stopping distance.
I recently had ATE ceramic brake pads fitted to the front and rear, and as the front discs were also found to be wearing down, I decided to replace the stock rotors with Brembo drilled rotors at the same time. The ATE pads were a bit over $420 + labor, and the Brembo front discs were $630 + labor.
Very happy with the combination, after about 3-4 months of driving now; and loving that there is next to no dust on the Rosarios, using the ceramic pads!
Cheers,
Matt.
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