What stats do druids need? Since we do a little bit of everything, we need a little bit of everything. Ideally, if we were going into a fight blind, we would have a decent amount of every stat and bonus available. Since we typically do know what role we are filling, what our personal playstyle is, and what to expect in the next fight, we often want to focus on stats that help us most.
Here is a prioritized listing of what to focus on for what specialized roles you will play in groups. Keep in mind that only the five primary stats are readily available until the mid-50 levels and up.
Healing Druids - +heal, Int, Mana/5, Spirit
Nuking Druids - +spell damage, +spellcrit, Mana/5, Int, Spi
Melee Druids - Str, Agi, AP, Crit, ToHit
Tanking Druids - Armor, Sta, Agi, Def, Dodge, Str
There will be many influencing factors that change these priorities around a little such as PvP vs PvE, particulars of a boss fight, etc. In PvP, for example, stamina becomes much more important to every role. For the most part while leveling you just need to make sure you aren't neglecting anything.
Here is a stat comparison page over on wowwiki and
another at wikispaces for those of you who want to really squeeze the most out of each gear slot.
Gear to get at level 70 To start raiding Karazhan a tank should be fitted to a minimum of 12k Health, 415 Defense (with Survival of the Fittest), 20k Armor, and 25% Dodge. A healer should be stacked with at least 1000 +Healing, 6k Health, and 8500 Mana.
Here in our forum, Anathor has kindly written
a shopping list for feral gear (tanking and dps) and
a shopping list for healers. Make sure you grab some of this stuff while going through Outlands.
For all questions about whether one piece of feral gear is better than another,
Emmerald's druid gear lists is a popular, comprehensive comparison list that lists Druid gear by slot and sorts them by value for tanking, burst dps, and sustained dps.
For a good comparative list for healing gear you can look to
this wowwiki article.