I have superformance 2807. Goodyear eagles gtII are the worse street tires ever! After a lot of work, road force balance, I could not get the shaking to stop and they just do not grip at all!
Avons will be the best 2000.00 you will spend on this car. All in, tires, shipping, tax, road force spin balance, then with the wheels on the car, take it to someone who spin balances with the front wheels on the car.
I have not seen used avons for sale. Always goodyears GT II, GY billboards, but never avons. That should say a lot. I love these tires. It was a lot to spend on tires, but they are worth it. No regrets.
I have heard these tires only last 7 to 10,000 miles. Threadwear of 80. Great tires, but not cheap.
http://rogerkrausracing.com/pages/pricing.html