My wife bought me a pair of Oakley's a few years ago for over $100 and they fell apart in less than a year. Based on that experience, I see no reason to pay huge sums, but I don't just get the cheapest either. Right now I am using the Scattante Matrix glasses from Performance. They stay rock solid on my face with no slippage, comfortable, and have interchangeable lenses. They can often be found on sale for $30-$35. Some of the new ones omit the clear lenses, so if you are in the store, open the boxes and check to see if it has 3 sets of lenses or just 2.