Thanks for all the feedback so far. I have heard good things about Smiths so have been looking at them a bit. I do want to get into a fly shop to try some on, but I wasn't sure if I could tell how they'd do seeing into the water based on how they perform in the store. I'm interested in the gray lenses as I've really only heard about amber and rose lenses for fishing.
Hardy, I know about losing sunglasses! I won a nice pair some time ago and lost them shortly there after. Now I always have a strap attached and I haven't lost a pair since.