Regen is very powerful, I suggest Troll/Iksar.
Frontal stun immunity only matters if you are tanking and you cannot root/kite. A slowed mob will hit very rarely and you should almost never eat an interrupt from a slowed mob, when you do it can be from push and not from stun (which ogres get interrupted by). A raiding and grouping shaman should almost never be taking hits to the face. They should however constantly be using Canni and therefore regenning back HP. Allowing them more canni casts before a Torpor is necessary at high levels, therefore being more mana efficient allowing more buffs or slows or heals on a raid/group.
Iksars can't use JBB but a lot in Velious is cold immune so thats rather moot. Epic and DMG DoTs are best at 60 anyways, especially with their recent increase in efficiency.
Stun immunity is vastly overrated.
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