My sunnies tend to get knocked around a bit so I only by specks with glass lenses. They feel tad heavy at first if your used to plastics but you get used to that. Definately go non-polarised, Kingairs, Metros and the like all have polarised windshields. Any cheap plastic safety lenses are also no good for this evironment, they discolour and scratch over a period of time and will make your eyes work harder. A CASA medical eye specialist once told me not to spare the pennies and look for quality, we use our sunglasses for many hours each day and if they are not good quality they WILL damage your eyes over a period of time.
I use rap-around Rays, after my 20% discount from private medical they cost around $165.00 and last me at least two years per set. You can also buy spare lenses and frame parts if they get damaged.
I dont like the Ray Ban Aviators as they are not rap-around style. They were originally designed specifically for the US Air Force to be worn inside a helmet where there is no side glare.
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No more soup for you!