I know exactly what you mean by the Oakley lens scratching easily. I keep on buying them. I have owned other brands, but I have a small head, and Oakley seems to be the only ones that stick to me. However, I cannot recommend enough the quality of Oakley bronze prescription sunglasses---they are in a different category from their retail lines. 3 years and thousands of hours of wear-time later, they are as good as the day I got them. My wife as surprised how I would wear my sunglasses even when it started to get dark. When she tried them, her comment was, "how can sunglasses make everything brighter?"
However, when I got my sunglasses, Smith Chromapop were not producing prescription lenses, but they are now. I feel they have some of the best contrast of non-prescription lenses.
My prescription Oakleys cost around $600.