I've been disappointed with my recent polariod (polarized?) purchases. The camera folks are selling something called 'circular polarization' filters, which I won't pretend to understand. Recommend you hold a pair of glasses in front of you while looking at something giving a reflection or glare - do any cars still have chrome bumpers? As you rotate the glasses, you should see the glare appear and disappear. Hopefully the glare disappears at the position you'll be wearing the glasses, and not with the lenses above each other! Another trick is to take two pair and put them in from of each other - as you rotate one, they should go from light to dark.
Personally, I've always liked the Ray-Ban aviator style, but they've gotten pretty pricey.