I don't wear sunglasses that often. One reason being, its often not sunny where I live, and I think I have pretty nice eyes so I don't really cover them up too much.
My favorites are Aviators and I think Ray Bans know for making them but theirs Gucci and my favorite Dior Homme as well. Their probably my favorite but I rarely wear them, had a knock-off pair a year ago but they broke.
For some reason I never really liked the Versace sunglasses, I found them a little tacky, with the huge Medusa heads of the sides, too flashy for me to wear. I like more of a classic and simplistic look to sunglasses.