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Stock pads work great for most applications including infrequent track days on street tires. Texar and Mintex offer OEM quality pads for less $$ and are fine for street use. Running different pads front and rear is done often in racing as a simple way to move your brake bias forward/aft. For normal street use using similar pads is recommended.

If you switch to comp tires and carry a lot of speed at track days you may want to use a high temp pad such as Pagid or Raybestos. They are a lot more $$ and are not as street friendly but hold up to abuse pretty well. I ran Pagid yellow on the front last year and ran 15 track days on them. They worked well at temp but seemed to deposit goo on the rotors that caused brake judder. I recently switched to Raybestos ST-43 on the recommendation of a Boxster long time hot shoe. Two track days and so far so good.