I guess I'm semi qualified in the sense that I work at an oakley store haha.
Basically it comes down to what base colour you want in your lens. orange (persimmon or HI persimmon), brown (black irid. Fire Irid. etc.), blue base (ruby clear which I think has a blue base or emerald irid.) or the few others are Pink Irid, HI yellow etc.
Now I'd say the best all around lens is a emerald iridium, it had a decent light transmission percentage plus the iridium coating will reflect the light pretty well when it's sunny out.
Other than that, like the other guy mentioned VR50 Pink Irid will be a good lens. Also, I just started using a HI persimmon and I really like it.
Hope I helped a little bit.