Just go with the Blue Sensor Mirror. Best all-around goggle lens I've ever used. If it's not dark enough for you for bluebird days, pick up another lens to use for bluebird. But, the BSM is a great lens for everything short of all out bluebird days and is still quite usable on those.
"People say that marijuana smoking is going to get in the way of my career. I say to them that on the contrary, my fighting career is getting in the way of my marijuana smoking." -Nick Diaz