I have a pallie and 4 shamans and in my opinion Ramparts, Blood Furnace and then Mana Tombs are the easiest way to 70. They are short, easy, there are many mobs to kill, there is a lot of green loot from the trash.

I tried the other instances and they were either too slow or too hard, and none offered the xp and items/hour ratio that the zones above did.

So I did 60-70 with 3 instances