For a dd and rare occasion track car I'd just go with Brembo blanks. Even slotted cost you pad life. Granted slotted are typically camfered I still feel they still contribute to quicker wear. The reduction in surface area isn't really worth it if you're running a good low or medium low dust brake (See: EBC Red or Porterfield R4-E kevlar pads) or any high friction, heavily camfered and vented pad (such as EBC Blue).
I would be more inclined to run the front and rears matched. The thing many people don't take into account is that from the factory they're designed to be the same material and the rear pads are SMALLER.
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