Have a Bio Armor/Spines tanker that I am enjoying immensely. Bringing Spines to tankers is a great and good move. Dark Melee now has competition as the 'why didn't you take this instead?' secondary for tankers. Dark Melee is for the tanker who wants to survive everything; Heraclea got through a Rikti ship raid yesterday and her health barely dipped. Spines is for the tanker who wants to monopolize all of the mobs' attention. It also would go to the top of the class for Willpower tankers who want to be whole-spawn tanks, especially after Quills. Bio Armor is interesting as well. I don't think it will ever be as tough as, say, Invuln. But it has several 'oh snap' buttons, not one, without the disadvantages of something like Unstoppable, which I never take on a tanker anyways. So difficult alphas and adds don't faze you. The only serious problem with it is that, like Fire Armor, it is at risk for animation lag, so Bio/EM is a definite no. Finally, Spines and Bio Armor work together well for concept, even if it doesn't quite fit this character's concept, which I developed in the playing thereof; she turned out to be an emissary of an Aztec goddess sent to Paragon City to kill Skuls. (Total ripoff, you know.)
Thought of yet another concept, so I'm finally trying a Mastermind. Beast Mastery/Nature control sounds cool.