Monkee,
Go back to an earlier question. What do you want your tires to do? High performance tires capable of speeds in excess of 130+ MPH, and will stick like glue in corners, are made from softer compounds and will not last a long time, maybe 20K miles. Expensive does not equal last longer!!!
50K, 60K, 75K, high milage tires are made of harder compounds, but you give up some performance capabilities.
Do you want an all weather M&S that will last 80K? Match the tires to your use, e.g. daily driver, versus SCCA Roadcourse only!
High performance tires do not make sense unless you upgrade the brakes, the suspension, the steering, and stiffen the body to minimize body roll. IMHO, rangerj