Take a look at these tires and their very aggressive tread pattern, especially at the outer shoulders. Forget about the low cost for a minute - these are world class tires performance-wise. Isn't that what we are looking for in tires for our 911's? Google some reviews of these tires if you don't believe me. I'm just trying to help a brother not to spend way too much money on his tires (I know, I spent almost $300 per tire for my S03's a year ago and they don't compare to my RT-615's).
The Falken Azenis RT-615:
The Hankook Ventus R-S2 (Z212) tire: