Are you looking to cast arena or heal in catas?
Either way, go full int for stats (Possibly 5-10 vita if going solo arena)
For arena, look for daggers/staffs (Pref staffs as they can be used on warlock as well) with good int for the item level
Same with armors
With charms, higher the ee, the better.
You'll need to have heal charms as well, again. Higher the ee, the better.
For catas it's different.
Pretty much on all 3 main item (wep, armor, main slot charm) look for good hm for the item level.
Look for high ee heals for acc slot (remember, only ee works in acc)