Ok we have a holy pally, resto druid and priest healer. The priest is disc atm from personal preference but doesn't mind changing for the raids sake. He went disc thinking the crit healing buff would make disc viable. What spec would be more suited to our raid for firelands progression for 10 man.
http://us.battle.net/wow/en/character/thaurissan/Z%C3%A2rroc/advanced
That is his gear.