Greenlisted magic items

[Dark Ass4ssin 1]

So my party has recently pulled off a feat of epic proportions, they are all lv.9 and I wish to reward with magic items custom tailored for their characters. My issue being is I have never been good at deciding what is or is not fair, so I was hoping that some saint in the playground could greenlist balanced items. (The party consists of a Wizard, Barbarian, Fighter, and Cleric)

[Gnome Alone]

What edition is it? Because that is relevant to both what magic doodads they should/can get, and how this should probably be moved to the appropriate subforum in the first place.