If you want them to improve your ability to spot targets in hazy conditions you want something that blocks blue light, that means orange or tan. Pretty obviously the worst colour for aviation use would be blue.
I have a pair of Serengeti Pilots with a tan drivers gradient - excellent for spotting other aircraft and very little colour distortion. Initially I didn't like the wire frame but it was fine once I formed it to fit my head/ears; there's no chance of them falling off in neg g and they don't affect the effectiveness of the earcup seal.
Cheapest place I found was
http://www.sunglassescheaper.com - good service and a good price.
HFD