Hi, I am looking for my first pair of Oakley's, my only other pair of sunglasses is a Ray Ban. I know that I want a Flak 2.0 XL but I am having a hard time deciding between the Prizm Daily and Black Iridium Polarized lenses. The lenses on my Ray Ban are polarized and are not too dark. They are still pretty fine if I have to walk indoors. I really like the mirror finish of the black iridium, but is Prizm really that special optically to justify a slightly higher price? I live near New York City so I see a good amount of sun.