What next? Spirit or green? Depends on the situation of course. If you are in strong lead, then buying enough greens is pretty much the way. Usually when you are losing, you need to buy dmg. If you lead = more greens, if you are losing = more spirit dmg or counter items.
1 items
Mid Game greens to consider(sell spirit shielding for slots)
7 items
Core spirit items
3 items
Late Game items that I always buy, considered CORE