Costa Del Mar...worth every penny. I am on my 3rd pair of triple tails. I lost one and didnt have to think twice about buying a 2nd. I have broke numerous lenses (once on the way to bahamas, hence the 3rd pair) and Costa has replaced them at a very reasonable price and time.
I highly recommend getting Glass lenses, they are clearer and will not scratch. I like the Amber color, or if you spend a little more the Blue Mirror are awesome. And now they have a 580 type that is supposed to be unreal.
I can see sooo much in the water that i never could w/ cheaper brands.