my shammies are all specced ToW and I only leave ToW on one of them, my general totem set is below, I press the button 5 times - I remember reading recently somewhere that if your spell damage is below 4000 then spec ToW, after that don't bother as it's not worth it

shammy1
f:wrath
f:searing
a:windfury
w:healing
e:strength of earth

shammy2
f:wrath
a:wrath of air
w:healing
e:tremor

shammy3
f:wrath
f:searing
a:nature resist
w:healing
e:tremor

shammy4
f:wrath
f:searing
a:grounding
w:cleansing
e:stoneskin