I've been using this model for the past 6 months, now I wouldn't go windsurfing without them:
www.seabreeze.com.au/Shop/Scripts/prodView.asp?idproduct=25btw I wouldn't go the polarised model, it's difficult to see the water surface. Get the non-polarised model, it still gives you UV protection and helps you see what you're about to hit when you're heading out into the sunset