monk/cleric
I am having a blast with Monk/Druid.
I have mage/cleric and bst/wiz duos as alts.
The actual plate tanks need a lot of gearing up. Thats why I went with pets/monk for the up front action.
People that box ringers typically are trying to get gear for their weak toon that no one wants. It's just the way it is. If that toon is a DPS or healer they are allowed much more often than an under tier tank. If you want an under tier tank in a raid you should expect that you have to run it yourself.