I started playing as a full mage and I have with me all the four staves, and I swap according to the demand of enemies and my eitr. But with the game progression, more spells could be added and we can see more staves, which isn't good because there will be a stack of staves in the inventory.

About the staves, I use firstly the protection otherwise you can get hit kill, then I swap from fire to frost according to the enemies and summon skeletons so I can level up blood magic as well, that's why I carry all four.