What are you going to be using the team for PVP or PVE or a mix of both.

I would say if you plan on doing PVE heroics i would go with a pally as a tank. If you look at the forums a lot of people that had warrior tanks did not work out that well and rolled a pally and loved it. A druid tank is much like a warrior tank, so going pally might be better for you. But until we know how you are going to use the team we will not know how to help too much.