I'm having trouble deciding what lenses are best suited for my Radars and M Frames. Here are the intended application: Radar - this is my watersports frame...I have a Black Iridium Polarized lens right now and it's AWESOME on the water, however I know I should have something for not-perfectly-sunny days, maybe a VR28? What other lenses would you folks suggest for a frame that is primarily used on the water? M-Frame - This is my MTB frame...right now it has a Fire Iridium lens in it, which is really nice for riding because it does a great job of cutting brightness without making it impossible to see in the shade. What other lenses would be best for this application?