Any PvP/Tank builds?Follow

Pretty much like subject says, I am aiming at doing mostly pvp with my DK but I would like to be able to tank 5-mans/heroics on the side without spending all the gold on respec. I would of course have two different gear sets but I was just wondering if there are any decent builds that allow for doing both without too much fail. I was thinking of UH based but not entirely sure, anyone with some experience out there? Thanks ahead.