I got a set of AV65/66, and am getting to the end of the rear and was shopping. The AV66 is showing as OOS until June 12th, and the AV46 is coming up as discontinued. The AV65/66 do seem to get more mileage than the AV45/46 set, but the AV65/66 seem more squirrely to me.
I've had the 777, and didn't like it. I had a pucker moment when it broke free in the rain. Admittedly I was accelerating lightly in an off camber turn. But it was a turn I'd taken many times before on other tires. I had it paired with the 011 Verge front, which I did like.