Timco,
I've been using Sumitomo HTR Z IIIs and I am very happy with them.
I get 30k to 32k out of the fronts and 15k to 16k out of the rears.
I purchase them via TireRack and never came close to spending $600 for a set of four including shipping.
I started out with HTR Z IIs, but saw a track ready/prep'ed Cayman in the dealer showroom with HTR Z IIIs and decided to try them.
Just my two cents
MNC-I
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