Loot info from wow-loot is mad.
Shaman Pre-BC http://www.wow-loot.com/v1-shaman.htm
Shaman Post-BC http://www.wow-loot.com/shaman.htm

As for specs I would suggest that at level 70 you have 1 shaman 41/0/20 or 41/5/15 and the other 3 40/0/21(Lightning Overload/Natures Swift) for bigass burst dmg