I run with 6k spirit on my 6/14 heroic alt with nazgrim and sha trinkets, and i don't see the need to go above that. Very rarely, if ever, do i get close to OOM, and can easily sustain 250k+ HPS on heroic malkorok (yes, we are going malkorok instead of juggernaut, our RL is afraid of 2-healing juggernaut).
I decided to go that route when i read, on this forums if memory serves me right, that 400 spirit allows you to cast 1 extra rejuvenation every 3 minutes, while 400 mastery gives you roughly 1% more healing total, and since 1 rejuvenation every 3 minutes is less than 1% of all my healing... mastery all the way.
Here is my armory, should someone want to check.
http://eu.battle.net/wow/es/characte...%C3%AFe/simple. As usual any constructive criticism is greatly appreciated. I'm currently debating spirit vs crit. As in "haste (to breakpoint) > mastery > spirit > crit > excess haste" vs "haste (to breakpoint) > mastery > crit > spirit > excess haste"
EDIT: Also, balance chest is NOT an error, resto tier has spirit on it, and 4p is no that great (also no way in hell i'm NOT using norushen gloves OR shaman's helm, might swap to sha's helm if i decide that spirit > crit)