I'm kind of a sunglasses junky. I am also very particular about the quality of vision that I get. The best I've found in that regard are my Maui Jim glasses with the titanium ribbon bows. Very light, comfortable, exceedingly acute visually. Have gone through a number of Ray Ban aviators over the years. Several styles of Oakleys work well for me too.
Somebody will probably come on and say cheap sunglasses protect your eyes from UV as well as expensive ones, but there's more to it than protecting your eyes from uv. (Just like there's more to a riflescope than magnifying what you're shooting at.)
This in spades^
