2" blazers for me, I just switched over from 4" arizona. Still amazed that a little 2" vane gets the job done with broadheads. Much easier to tune than bigger vanes, less chance of the blazers making contact with the arrow rest.
2 inch blazers, 4 inch vanes on my hunting arrows (can't get the damn vanes off without destroying my arrows. Goldtip sucks!)
4" easton vanes/6 degree helica on my huntng arrows.I have a doz of a/c/c's super/lite's that i haven't decided on yet though.
3D Duravanes at 1.8" for me sometimes. I still prefer feathers and am taking a hard look at the Rayzr's for shooting out of my X cam bows. Need just a slightly lower profile than regular feathers.
2 inch Blazers, it doesn't matter how long your vanes (within reason) it is the damater and stiffness that matters, the Matthews dealer where i bought my bow, pattented the blazers, i have been shooting them for 6 years.