Re: better tires -- Michelin or Bridgestone
Had a go in a CaymanS which was (I think) on Bridgestones. Performance seemed good in the dry, nice and grippy on tight bends, but I only had a short run. Certainly better than Contis, which aren't as grippy IMO, and squeal a lot when they let go. This is my own limited experience of tyres other than PS2!