Hi,
i'm thinking about leveling a group of 5.
For the classic combination Tank DPS Healer, the DPS seem to be set with Mage,Mage,Lock(for Utility) or triple Mage for pure dmg.
I want do be good in dungeons, and doing some questlines.

But what about the possible combinations of tanks and healers?
Tanks:
Warrior: The typical one, maybe problems with threat generation for the first seconds.
Druid: Overall a solid choice? with utility (buffs, heal, combat rezz)
Pala: Great Aoe Tank, Depending on Mana. That's the things i read. Personally i don't get how to tank with a pala, low dmg, no spot, isn't that a big problem? Great utility (Rezz, heal, buffs)
Shaman: Not really or?

Healer:
Priests: Great Heal some utility, rezz
Druid: Heal over time, no flash heal, no normal rezz, more utility
Pala: Good heals? Flash heal, great utility
Shaman: Good group heal ... i'm not familar with him

I'm thinking of a druid tank and pala healer for more utility.
Maybe i'm missing some synergies or specialties or maybe i'm wrong about my assessments?
What do you think?