First hint: Warriors/Druids don't make good boxer Tanks; Palas work better as the 4shaman dps tends to outaggro the single target tanks, while Consecration = mobs stuck to pala like glue ;p

Personally, I quest the whole way up and run each instance as needed at the appropriate levels...others do nothing but instance grind, pretty much up to you whichever one you prefer or can stand lol