right now i'm using two pairs of costas
green/amber 400 fathoms & copper/silver 580 harpoons
The harpoon frames really don't move at all while fishing & looking back while running, don't need a cord on them. I can't tell much difference on the lenses, the copper is a slight bit lighter but does just as good of job on/off the water without the green eyed look.
got mine here
http://myworld.ebay.com/sun.shades/