NT555's seems to be pretty popular , they grip real good. not so sure if 15000 miles under "normal" driving is your cup of tea, i guess it depends on how you plan to drive your car. i'm pretty sure i'll need new rear tires well before 15000 miles. next time around i'm thinking about going like 295 or 305 in the rear, if nothing else for looks

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2006 Mustang GT Premium, SLP Axle Back, American Muscle Chrome DD Bullitt Wheels (18x9) (18x10) NITTO NT555 255/45/18 285/40/18, Steeda Race Cowl Hood, Steeda Slide Style Captive Hood Pins, Street Scene Generation 1 louvers