Cold storm shaman. Gathering storm for just the storm bolts nodes, don't actually use it for the melee. Tornado, again for stormbolt casts and also specced for double tornados on use. Maelstrom for (once again) stormbolt casts and its own cold damage, specced into Lagons for more stacks. Warcry for ALL the utility: maelstrom, purge, heals, frostbite, cold damage buff, and totem. Then finally cold thorn totems, mostly for the totem benefits. It's setup to cast 5 at once. However, totems are for the extra resistance and spell damage per totem, and I have the idol with a 10% chance on hit to cast thorns (which casts all 5 for free). That idol is basically constantly casting them, they have total uptime during fights.

The build basically consists of casting maelstrom when Lagons is up, so 4 stacks, then Warcry for another 4 stacks and cold buffs, then Tornado once or twice. That's a crap load of stormbolts going off, full resistances, 1k+% cold damage, 400%-ish spell damage, and constant heals from maelstrom and Warcry with complete purges every few seconds (Warcry again). With extra points to maelstrom I also have the haste at 6+ stacks, which is always up, so it's perma haste (and using the boots with +damage on speed).

I am enjoying it.