Obviously for me, It's Evolved Shaman. I use all Wiz except Luck on the weapon for this class. Or you can go full Wiz.
PvE: I don't normally use Elemental Grasp in pve except bosses. I use Furious Gale first then Freezing Flame and if I ever need a heal, I use Furious Gale then Refreshing Rain because Furious Gale increases the amount of heal.
PvP: I use Elemental Grasp first then Furious Gale and Refreshing Rain for the Heal over Time and then I start to spam Freezing Flame.