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Assuming the track car would only be driven on the track and to and from it, and the DD would be used for weekend drives, I'd break it down like:

  • DD: 356 Cold in the winter? Screw it!
  • Track: 993 Turbo
  • Burn 959

I'd rather burn the 959 than track and maintain it. The 993 Turbo is essentially a 959 minus the exclusivity anyway.