Originally Posted by
Maxvla
7000 spirit is plenty. The first week vaults was available I raided with that much and was fine. I still run around 7500 spirit with 490 ilevel now and am downing 9 of 16 bosses on heroic with it. The only fight that is tight on mana is heroic will of the emperor because it's 10+ minutes long and constant damage.
Stacking spirit for 10 man is very bad. You need throughput, not longevity. Druid is already by far the most efficient healer, you just have to learn how to play it in MoP. You have to be patient, let your hots do their work, learn what your other healer(s) spells will do and when they tend to cast them and balance yours accordingly.