For your staff, the only important legacy for raiding purposes is "Share the Power". I personally have a DPS staff, and then a second staff with just this legacy on it to swap to when I actually use the skill and immediately swap back to my normal staff.
The book has three important legacies, all majors: Debuff Resist (prevents your debuffs from being resisted), Beacon of Hope healing (LMs are pretty good at spot healing, might as well boost that ability, especially when you're gonna want the healing rating on your book maxed for power sharing anyway), and Signs of Power duration (Signs of Power: See All Ends only lasts for 45 seconds even with the yellow capstone, and it's on a 1m cooldown. This legacy will allow you to bring it to 1m15s at max, or 1m1s if you rank it just high enough to have it constantly on a mob). Inner Flame healing is also a nice minor to have if you trait the Improved Inner Flame trait.
Steam: Sneakeh Snake[/CENTER]