Honestly if it's your first event, you'll probably be fine on stock pads with upgraded fluid. If you really want upgraded pads, PFC08's are great. I ran them on my spec E46 and I think I'm running them on my street E46 as well. Plenty of stopping power, but they won't overwhelm street tires and they have good feel without too much initial bite.
Also, don't go crazy spending too much on brake fluid. Motul RBF600 or ATE are fine.
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