I have used Dirty Dog Wet Glass for the past few years. They are polarized, have hyrophobic coating to shed water and have removable strap. Nornally, these go for about $60, but I recently found an ad over on Sailing Anarchy for a promo they were running...sign up with Dirty Dog to join their team and they will give you 1/2 price on all sunglasses....FOR LIFE! So, I got a new pair of Wet Glass sunglasses...plus they throw in a t-shirt or ball cap.
Mike.