Staves are awesome. Just don't buy one with spells in it, for the love of god.
A +1 Defending, Eager/+1 Spellstrike, Warning staff with two wand chambers of Nerveskitter is awesome. Throw two GMWs on it, and you're adding (up to) +5 to your AC, and to saves vs spells. Alternatively, Smoking and that one that makes you immune to a specific spell are good choices. Ifyou want to 'cast' from a staff, just replace one of the wands of nerveskitter with a wand of a spell where the DC doesn't matter so much.