
Immortalis |

I would say armoured hulk would be best but spiked gauntlets dont work with the brawler rage powers. He does have spiked gauntlets in the books but the damage in game is bad, you would probably be best going unarmed as there feats and rage powers to increase this.
Armoured hulk is in Ultimate Combat and the brawler rage powers are in Advanced players guide.

MC Templar |

Armored Hulk is a variant in the Ultimate Combat, as is the rage power body bludgeon http://paizo.com/pathfinderRPG/prd/ultimateCombat/classArchetypes/barbarian .html
Brawler, Greater Brawler are in the advanced players guide, the cover unarmed combat during rage
Improved Grapple and Throw Anything are both in main book
http://paizo.com/pathfinderRPG/prd/feats.html#_throw-anything
Improved grapple requires unarmed strike... but the final bonus would be grapple enemy, pin them, use them as a weapon, and throw them like a thrown weapon when you're done with them. (alot of feats to get to that tho')