Help a new shaman out

Hi.
I'm new at shaman class, always wanted to play it but until now i didn't had the patience to learn it. I'm planing to go restoration and i have a problem choosing a starter trinket in pvp on WOTLK realm.
i don't know if to choose Show of Faith or Purified Shard of the Scale

http://wotlk.openwow.com/item=45535
I will use it, but better find some trink with spirit.

spirit for shaman? o.O never heard or saw spirit trinkets on shamans in pvp

Since when resto Shamans benefit from spirit? Dude...