Just a few advice needed on Ranger/Ele

For a shock sniper based build (this is in PvE btw)
would a you guys recommend:
(this is with runes and +1 hat)

Expertise: 13
Marksman: 13
Bestmaster: 2
Air: 11

or

Expertise: 14
Marksman: 12
Beatmastery:2
Air: 10

Also is it possible to put rune enhancement on seconday attributes, in this case Air magic?
Expertise reduces energy cost and recharge times right? but does it have any effect on dmg or casting time?

Thanks and apology for alot of questions but i'm currently a lvl 11 PvE only player getting the hang of R/Ele (which seems to be more of advanced and more diversable class than the warrior build or ele builds, maybe i should have started of with a warrior to know the game more better)