Serengeti is another underrated company, IMO. They aren't the most cutting edge stylistically, but they have a decent selection of styles and make a high quality product. Their lenses have some of the best optics out there; they are available in glass or plastic, and come with both polarized and photochromic technology, as well as antireflective coatings. The 555nm green lens is particularly nice, as it offers a great compromise between neutrality and contrast. The frames are acetate or metal, and some of the styles are offered in titanium. Some of the metal frames also have a proprietary feature they call "S-flex," that allows the frame to be sturdy, but the beta titanium arms are flexible to accommodate your head without much pressure. Customer service is good from my experience; they sent me a couple of hinge screws free of charge when one fell out.
Lamone sunglasses with 555nm photochromic and polarized glass lenses and titanium S-flex frames:
Edited by Tsujigiri - 5/25/13 at 7:14pm