Personally I don't bother with Share the Power at all. Of course this might depend upon your power pool, but in 'support mode' I usually have around 9k power so I have never really felt the need for Share the Power. It could be handy to maximise the efficiency of your power transfers if you find your power pool coming under pressure though.
I'll just post a picture of my staff to show you the legacies I use. This isn't quite how my staff looks now since I changed some stuff around, but the legacies are the same.
I use two books, one for damage and one for support. I would recommend making the support book first though as it will probably see more service.
For support legacies I use Beacon of Hope Healing, Signs of Power Duration and Debuff Resistance. These are pretty important legacies in my opinion. Inner Flame Healing can be useful too if you have the trait slotted.
For damage legacies on my damage book I go for Fire Skills Critical Rating, Burning Embers Pulses, Fire Damage Over Time and Damage Skills Resistance.
Last edited by MrWarg; Jul 17 2012 at 02:28 AM.