instead of a staff having a specific power like fire of frost or whatever, they should have a spell multiplier.
an example of this would be if you have a staff in your hands and you cast a fire spell like you would normally, it comes out your staff instead but with a damage multiplier of 1.2 for example.
maybe the second you join the mages guild you get a scruffy old tree branch like in obivion that gives you a small multiplier like 1.1 and you can find, buy or earn better staffs that look more stylish, like saruman's one with a higher damage multiplier.
let me know what you think?