Category 1 Extra Charge, Healing Rite, Mystic reach always. Rest as needed for lane (buy like 6 500's minimum)
I500
I500
I500
I500
I500
I500
I500
I500
I500
Category 2 Health nova + divine barrier first. Then save for rescue beam, and get healing booster after. Then CDR + save for Refresher (or buy some more 1250's if you need to be stronger earlier)
II1250
II1250
II1750
II1750
II1250
II1250
II1250
II1250
II1250
II1250
III3000
Category 3 Refresher first, then upgrade your spirit items for 3000 souls. Cooldown + Duration imbue Ult, Improved reach imbue your 1. GG