I'm new to the whole Oakley/Sunglasses thing in general. I am buying my first pair of Oakleys, The Flak Jacket XLJ. The polarized versions are about $50 more, are they worth it? I do not fish, which i heard is a big activity in which polarized lenses help. I will only wear these for daily uses; walking around, driving, beach etc. Not for sports, not for anything other than a general use. Do you guys think i should buy the polarized lenses? Also if i bought them without the polarized lenses and later realize i want the polarized lenses, can i just buy polarized lenses for the flak jackets and throw them in?