I used to have scroca's policy about sunglasses until I started having to wear eyeglasses for vision correction. I became much more aware of the value and fragile nature of glasses, mostly as a result of losing a pair, and breaking another. At any rate, I wear contact lenses now, but I always have some type of UVA/UVB eye protection for when I'm outside.

To the OP, I'm a big fan of the Native line of eyewear. http://www.nativeyewear.com/eyewear/sunglasses/list

2 main reasons:

1. Lifetime Warranty - I've had 2 issues with my first pair and they were taken care of seamlessly by the company
2. Interchangeable Lenses - this is really nice - you get varying degrees of transparency with a typical set of lenses - I wear the clear or yellow lenses for my dark commutes, switch to the orange ones on overcast days, and put the dark ones in for bright days.

3. Bonus - the dark lenses are polarized, which is a big plus for me as a flyfisherman