Use Thunderstorm for questing
For PVP, you should max out both of these tiers to grab both Thunderstorm, a nifty new pushback spell for us and Storm, Earth and Fire. For PVE, both of these talents might be considered a waste of points. However, in practice, as a PVE shaman who breaks all the rules, you can use Thunderstorm for questing and found The Chronicles of Spellborn Gold a lot of fun. Still, on balance, people will probably flame me for putting it into a PVE build so just left it out, preferring to sprinkle these points elsewhere and take Ancestral Healing too.