I don't have that much experience on 10man but I belief you want to bring a holy pally for beacon heals or a dk tank. Without 1 of those 2 specs you might struggle a bit on purple. But maybe someone with more 10man experience can say if a pally tank+ resto shammy/druid is a viable setup.
5 stacks of deep corruption will do aoedamage to the whole raid.
As for gear I would go with souldrinker, mirror and indomitable pride.