Defensive disc tanking with the firepower of a shadow priest? Yes, please.
As a druid, I would not say druid. As resto, I'd like to have typhoon and star fall sometimes, those would be handy. The feral stuff would be rather useless except to boost my defenses a little bit. As feral, I'd have no spellpower, so all the caster goodies would be meh.
As a shaman, I would like thunderstorm on my enhance and feral spirits on my elemental, add in earth shield and riptide... yeah, daddy likes that.
Nothing else jumps out at me.