Today I had a blow out. My Bridgestone Potenza RE760 shredded. It was not worn out, but stuff happens. No drama BTW, just pulled over, totally controllable even at highway speeds. So, now I have 3 really fine Potenza RE-760s with about 1/2 the tread left. I could (A) buy 1 more same tire and have uneven wear (B) buy 2 new of the same size and have uneven wear ft vs rear (C) buy 2 new different model tires (like the hot new Michelins) or (D) buy 4 new tires. What do you think about running mismatched wear levels and or different models front & rear. My car has M5 staggered size wheels.