MW is really hard to stat optimize.
Haste for healing;
Stamina for when you're focused (hard to peel some classes);
Spirit because you oom harder than any other healer;
No Vers/Int, in my opinion - the damage aspect of Vers is wasted, which causes me to innately reject it due to inefficiency. Intellect doesn't scale with Surging Mist (your main source of healing) due to Blizzard's failure to convert Int->AP at low levels - but of course, Enveloping and Soothing Mists are crucial parts of your healing and they do scale.