I got tired of replacing my tires after a season or season and a half, so I went with Continental Extreme Contact DWS tires. Have been running them for a couple of seasons now (6,000 miles) and they still look almost new. I'm happy with the way they handle, (I don't track my car, but I do enjoy hard acceleration). They have the highest wear rating of any all-season tire I could find.
They look and work great and were recommended by my friend that drives a 993 after he got less than 2000 miles on his previous set of rear tires. I waited to buy them until he had two seasons on his tires and they still looked great. He's on his 5th season on a single set of these tires now.
Check them out if you want better tire life. I don't have a tread depth gage but here is what the rear tire tread looks like after 6k miles:
Threaded Mode
