I agree Costas aren't the only quality sunglasses, just a personal preference for me. I have researched, read, and tried on other brands as well. For me, the visual quality of the costa 580 glass lenses outperform everything else I have tried. There's a ton of other high quality manufacturers too though like you stated, some including Ray Ban, Maui Jim, Oakley, Kaenon, Smith Optics, etc, I'm sure the list goes on and on. If the Ray Bans work for you and you're comfortable, that's all that really matters. I really think I made the right decision getting contact lenses, so far so good . I also think I got a good deal on my Costas, I paid $180 for a brand new pair of $249 glasses.
I ended up just buying a pair of regular 580 glass green mirror fisch costas. Thanks for the tip though. Me being in college, I'm not as loaded as you "old guys" .