If you can locate a copy, you should read the discussion on sunglasses in Richard Taylor,
Human Factors: The Forces Within (1991), pp. 63-76. Among other things, the author gives high marks to Bausch & Lomb's Ray-Bans (with G-15 or G-31 lenses) and Corning's Serengeti Drivers.
This little article may also be of some assistance.
Glad you got rid of the aviators - unless "70s porn-star" is the image you wish to convey
One good thing about most "aviator" style glasses is that they are fairly large; there's little point to tiny sunglasses that permit a lot of light to creep in around the lenses. Function is more important than image.