I don't know about the rest of you but I am kind of a Sunglasses junkie, I thing I have 20 pairs floating around. I have several pairs of expensive ones as well figured I would share some recent observations. First off let me say I have an added concern whenbuying shades as I also ride a Harley so I need them to block wind as well.
I have worn Gatorz as my favorite for several years, they have an aluminum frame and you can get the lens replaced or frames rebuilt for life for $60 at most and that is a total rebuild or replacement, obviously these are not cheap glasses. They run in the $150 range depending on the lens you pick. I have 2 pair with different lens types, more on that later.
I recently went to Las Vegas and both of my pairs of Gatorz had seen better days and needed a rebuild. I like them so much I figure buy a third pair to wear while they were getting repaired. I tried and could not find what I wanted anywhere, backordered. So one of the companies that sells Gatorz also sells Liquid and convinced me to try these, also expensive. I ordered these, they are polarized with blue mirrored lens
http://www.activesportsunglasses.com/liquid-tflex-200.htmlI wear contacts and to be honest have been less than impressed with these expensive glasses. They look cool, but the lens is just not as clear as it should be most likely due to the wrap around, I have never been thrilled with them but it was all I had in Las Vegas and they did do a very good job of blocking the Las Vegas desert sun.
I sent my Gatorz in for repair, they have some new lens since I first bout them, one that gets lighter or darker and one that is a "blue blocker" I had them repaired with one of each. The ones Transition lens seem to be very fast to change and get surprisingly dark I like them a lot and will be great for driving in the evening or on cloudy days when you just don't need dark glasses. They are not polarized but work very well and are easier to see somethings with that the polarized, almost no distortion from the wrap.

I also got the Defender blue blocker and I am super impressed with these, they do some magic thing and block blue light, I guess you wouldn't be able to see Smurfs at all. I don't know how they work they just do, they are far superior to my polarized lens. I was driving home last night and the sun was behind some clouds and making a very bright halo around the cloud, it hurt my eyes to look at it with out the glasses and I was driving right at it, with the Defenders on the difference was fantastic, didn't bother me at all. I have never tried the blue blocker thing before, but it works! I know they sell cheap versions on TV and eBay if you don't want to spend a ton but it is worth a shot if you never tried them. Here are the Defenders I have, this is the third set of lens in each of these frames and I have had the ones below for at least 10 years (they replaced the frame and all on these this time)

If you have any interest in these just search Gatorz on the web, they are available lots of places including direct.