Either Priest or Shaman. I hope they add this heal-through-damage theme for discipline priests, then definitely will play that. But I didn't see it yet.
I've been playing balance druid in wrath of the lich king so wanna give that a try on SoD. Hoping the rune for making wrath not cost mana helps fix the mana issues they had in classic. Although will still definitely miss having eclipse, would be cool if they added that as a rune at one of the higher level brackets.