dude, the avons are wicked. You get wayyyyy more tread on them. I had the Bridgestones before them, the bridgestone front wore out about the same time as the rear, which was about 4000 km. They are frickin brutal tires. I've put about 5000km on the avons I have now, and they are definitely good for another 5, if not more. They are great in the dry and wet, don't let people tell you otherwise. Oh, and I'm not the easiest on tires; pretty well do anything you can to em, I use the whole tire- theres a reason they're called "chicken" strips.
Kalan