Xazeal - I bought the Prima guide since I was traveling all day and could read it on the way. The game is downloading now, but according to that (sometimes wrong) guide:
Flying Vacuum (10,000) - yes, a flying vacuum
Philosopher's Stone (40,000) - turns other items into gold
Alpha Dog (20,000) - for Werewolves - Sims tremble more and bites are guaranteed to be effective in turning Sims into werewolves
Magic Hands (20,000) - for Witches - no need to use wands and spells never fail
King/Queen of the Fae - for Fairies - summon other fairies, change wing shape and color at will, and less drain for magic