Someone mentioned Persols in one of the old posts. They aren't cheap, but they are probably the best sunglasses you can buy (arguable, depending on the activities you intend to wear them for, but for driving and not playing sports they definitely get my vote). If you can swing a pair with their polarized lenses you won't want to wear anything else ever again. They are more of a "stylish" sunglass than a "sporty" sunglass, so they aren't necessarily light weight, but the crystal lenses have probably the best optics you can get.