Good staff lvl 20 mage?
Rod of the Sleepwalker drops in the Blackfathom Deeps instance, and is a little bit more intellect, but because it has spirit on it, you'll usually be rolling against the healer for this one.
Your other option would be to get either of the BOA staves. You can get the PvE one by saving up Darkmoon Faire tickets, and the PvP one can be purchased with (quite a lot of) honor points.
The quest requires that you use the LFG tool to join a dungeon group for Shadowfang Keep where you'll need to collect some items. It's a relatively easy run. Just don't stand in front of the last boss. Cast your spells on him from the landing where you first enter the room.
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