Hands down best armor a druid can ever acquire, would be Dragoncraft Full-plate. Its hide so druids can use it and it counts as medium armor, but it is rediculously expensive coming it at a whopping 12500gp; stats would be +8 AC, +1 Max Dex, -3 AC penalty 35% Spell Fail and weighs 50lbs. The armor also has various effects based on the Dragon used.Dragoncraft is on pg 117 of the 3.5 Draconomicon. Very expensive but once you have it you won't find a better armor for your druid.
