Hi i have a 43 druid, and I totally know what to points into.
Heres my breakdown, btw, i only have 302 cm points at the moment, and i can see that the remaining cm's will make a huge difference in being even stronger.
1. 2 mains, wis and dex...you need 200 dex for one of the 55 master classes, and the other needs 250 wisdom..But heavily into both, wisdom gives you resists, and dex gives you more damage potential with your spells.
2 Stamina, forget charisma as a main 3rd stat, cause without stamina your gonna die a lot, and a druid is a good solo character as long as you have the sta and ac to do it (your buffs help a lot with this) I think one of the master class stats as well as some of the cm's need 150 stamina.
3. charisma, just get this to 100 for the cm's that add to it and you should be fine
i have decent armor with my buff (1680 i use a shield too) and with spells a ice and fire resist of 200+ so with heals and DoT and Direct damage i can solo most yellows np. Im no tank but for a healer i can take a LOT of punishment so stamina and ac are definetly important to your mix.
Hope this Helps :)