Tyrannon

Hiho, What classes are good Tankhealers? We are about to start into HC Raids, but want to eventually go gor mythic content as well. Sadly no one of us is willing to play Holypala. We have 2 Diszi/Holy Priests, one Mistweaver, one Druid and a Resto Shaman. I know everyone uses Holypaladins for that, but are there any alternatives? What is the second and third best Tankhealing class in the game? thanks, Tyrannon