I don't like the passive healbot mode with the Paladin. I switched to Prot and it is working pretty well for me. I've made a DPS priority macro just like the DK one Mosg2 setup.
Now, if I am running with a pocket healer, I think Shaman might be the best bet. About the only thing that bothers me is fear bombing and tremor will be lovely to deal with that. Holy pali might be better able to survive, but I think I can keep any melee off the Shaman so all it would need to worry about is potential range DPS. With BL + Tremor ya, I think I'd love me a pocket shaman healer.
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