Drive on what you have and spend the money on seat time. Fortune Auto makes good stuff, and the 500's are plenty adequate for recreational driving at the track.
If you were going for time attack, I'd say the upgrade might be worth it, but I'd really recommend spending the money on a really good suspension like MCS' or maybe even Ohlins TTX($$$$$).
That all said, I've got Ohlins Road and Track's, valved to the 1M kit specs by 3DM Motorsports, running Swift springs 7k front/16k rear, and I've got Vorshlag camber plates. I LOVE this setup, and there's nothing other than bushings in the rear end that I want to change.
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2012 BMW 328i 6-Speed Wagon | Deep Sea Blue with Grey Dakota Leather | Manual Swap, 330i Intake + Tune, 3.15 Helical LSD, Öhlins R&T
(SOLD) 2009 BMW 128i 6-Speed Coupé | Monaco Blue with Black Sensatec | chris_flies' 128i thread
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