Would not want to roll a Dark tanker as a first toon - the build will need a sugar daddy very early - but once you solve the endurance problem DA rocks. Dark Melee benefits other sets more than it does Dark Armor, which already has one of the best self heals available. My DA tanker is DA/Savage.
Of these listed, Dark, Electric, and Radiation are probably the strongest and most fun to play. I would consider Inv/SS and Super Reflexes/Martial Arts or Reflexes/Katana to be matching sets as well, even if I can't recommend Super Strength right now and Reflexes takes a long time to get that good.
AFAIK you can now approach them all regardless of your origin. I know I have done Azuria on several different characters, mostly out of nostalgic fondness for the first Hellions door mission. None were magic origin.