I find that just asking who wants what is so much easier. In 5 mans, much less raids, its still important to build trust among members. I'd trust members to do what they do best. After all, they know their own class best.
Though the standard priority is:
Locks/Mages/Dps Druids/Rogues/Fury Warriors get Salvation
Healers/Shadow Priests get Wisdom
Tanks get Light
Kings for those who ask for it
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http://www.wowarmory.com/character-sheet.xml?n=Saritenite&r=Dath'Remar