If at all possible, find a way to try goggles on before buying them. The problem with buying online is that you don't know beforehand if they'll fit your face, and many companies won't take them back due to health concerns.
Are there any sporting goods stores selling goggles at all near where you live, perhaps in the larger cities?
Tint is less important than fit and seal. If you can put them up against your eye sockets, press in slightly, and they form a suction seal when you try to pull them away - all without actually putting the strap around your head - then they'll be all right. If they pull away very easily, you'll likely be contending with leaking and constantly having to tighten them.