Blood Elf Paladin on Stormrage.
We have TK for lulz this afternoon and then progression BT tonight, going to be clearing Naj'entus, Supremus and Shade before making more Gorefiend attempts. I've only been playing since last summer, so I'm not ready to throw in the towel yet.
Skull108, we generally find it easier to have ranged be cube-clickers and let the channeler tanks plug away at Mag's backside. Also, the fight you're probably thinking of in SSC is The Lurker Below. He's pretty easy, but after that you have your pick of Hydross, Leotheras, or Tidewalker, all of which take some getting used to (and Hydross and Leo require resist sets of varying sorts, so they're not undertaken lightly.)