Best lvlin combo for Druid ?

[Ivina]

Warrior is a very good choice for higher levels.
For open world optimization, use feral spec.
She will keep aggro while you can shred the mobs from behind in cat form.
At any moment you can switch to elf form and heal her!
For dungeons, as said in another post, use heal spec and forming a group will be easy as hell.

[Norjak]

Druid+Warlock has good synergy - Life Tap & just keep hots on the Warlock for constant damage & Druid can Innervate (not sure what level Druids can learn this, I think 30.)
Also, Druid can just level as Feral cat for good sustained damage while saving mana to pop out into humanoid form for healing. Level as Alchemist/Herbalist & you can keep a supply of mana pots handy whenever the Druid runs low on mana.
Sorry for the thread necro, I just came across this.

[venven]

Druid+Warlock has good synergy - Life Tap & just keep hots on the Warlock for constant damage & Druid can Innervate (not sure what level Druids can learn this, I think 30.)
Also, Druid can just level as Feral cat for good sustained damage while saving mana to pop out into humanoid form for healing. Level as Alchemist/Herbalist & you can keep a supply of mana pots handy whenever the Druid runs low on mana.
Sorry for the thread necro, I just came across this.

I second this. I played quite a few times with Locks while leveling and it turned out to be extremely efficient.

[Viorus]

Druids pair well with any class. Glad she went with warrior.