I put 32,111 miles on the tires which shipped with the car from the factory. They were Bridgestone Potenza A030s, the size was P225/45ZR18. These tires seemed to be too small for the wheels.
The new tires are Kumho Ecsta SPTs, in size 245/40ZR18. These seem to fit much nicer, and look much better, plus I get an extra 20mm or so of tread width!
The old tires had a treadwear rating of 140, the new ones have a treadwear rating of 320!