While guys across the country having been donning Wayfarers and Aviators for the past year or two (not that I have anything against either of those glasses), guys in the South have stuck with their Costa del Mars.
Coming primarily from a deep sea fishing tradition, Costas do have a bit more of a "sporty" look than classics like Aviators or Wayfarers, however, their styling has always been more subdued than Oakleys, and the ability to get nearly every pair in tortoise shell is a great plus. These glasses are more than just a pretty face, though. Their polarized lenses are top-notch, and not only are they well-constructed, but every pair has a lifetime warranty so, in the event that they do break, you can get them repaired, and at no charge if the break was due to a manufacturing defect.
I've had a pair of Deep Blues (which I think are their best looking model) for three or four years now. They have been great glasses, and after wearing the polarizing lenses, no other sunglasses seem to work as well. While the first pair that I had did break at the hinge a couple of years ago, I mailed them in, expected to follow-up with a $30 or $40 check to pay for the repairs. Instead, Costa sent me a brand new pair at no charge. If that isn't good customer service, I don't know what it. My only complaint about them is that the blue mirrored lenses that I haven't aren't the best for duck hunting.
Costas are especially popular in South Carolina, perhaps due to that fact that most everyone does deep sea fishing, or wishes that they did deep sea fishing. Of the nineteen people in my grad school class, eight of them owned Costas, two of those were girls, and five of them were from South Carolina.
If you're looking for a pair of good sunglasses, I would highly recommend looking at Costa del Mars. They have really expanded their styles and have a number of different lens types, so there is likely a pair that suits your taste. They certainly aren't cheap, but for the quality of the glasses and lenses, and the lifetime warranty, they are worth every penny.