I started this thread back on FoH and since then have used Zenni multiple times. Just got a pair of sunglasses from them. Turned out fine. Might try sport goggles for mountain biking next as my expensive ass prescription Oakleys are starting to fall apart from sweat damage. May try transitional lenses in them as well, though its not the greatest idea for riding in the woods but I could go with a lighter tint perhaps.
After trying a variety of shit from Zenni, I say stick with full plastic frames. The wire frame stuff is generally god fucking awful compared to what you get at the store in my experience. I probably just made some bad choices, but enough so that I won't try wire rims from them again.