I've got really light sensitive eyes, and need a good goggle (or replacement lens for my oakley crowbars) for sunny days.Someone told me that polarized lenses are bad for snow, because they make it harder to differentiate snow from ice. Any truth to that?

Fire iridium would be another good choice. One of Oakley's best lenses for bright sunny days, with a high protection index and good contrast.

so oakleys two darkest lenses are black iridium polarized and gold iridium polarized. both with a light transmission of 9%...polarized lenses will block the blinding glare off the white snow so that will probably be good for your sensitive eyes. however people do say they may not provide the contrast the eye needs to distinguish ice patches or moguls...however the gold iridium polarized lense has an increased contrast rating (as opposed to the neutral rating that the black iridium polarized) and the lowest light transmission so that would probably be your best bet.