So far I have been using a 1HB and a shield with my Pally. I do find if I overnuke or overheal I lose aggro. Of course sometimes that is just the way it is going and you have to deal with it. I have had a lot of pallies tell me to get the argent a big ole 2hs because it hits for tons and the slow swings makes it easier to cast your stuns and stuff in between.