Yeah, didn't mention, but I've actually replaced both front and rears before, each time with the GY Eagles. It was just this time I'm thinking of doing the Michelins.I had to replace my Contis on the rear and TireRack suggested to stay with the Contis and not mix Michelins on the rear and Contis on the front. The Goodyear’s originally came on my car and I replaced them 3 years ago with the Contis because the 4S weren’t out in my size yet. The Goodyears were not considered very good tires, and I felt some improvement going to Contis. Your Goodyears are 6 years old which is the edge of their lifetime. Replace all four and get the Michelins.
On another note, I t’s strange that the rears are good and the fronts are worn. That’s unusual.