Without any doubts bring a shaman.

Poison/disease is a must on certain encounters, a tremor totem will make your life alot easier.

ToW,Bloodlust is also to big bonuses to your dps.

I keep my hunter pet on defensive, then it attacks the same target as my hunter. There are times thought when my hunter gets attacked before he can attack and the pet goes solo on mobs and dies. This happen very rarley and is not a big issue to me atleast!