I will stuggle to hold aggro - goodness knows when I was levelling my first shaman to 70 I could pull aggro off a tank with my lightning bolt/chain lightning, even after a few sunders (I was doing about 450 dps at 62-63).

The shaman could take a few hits while aggro was being reestablished.

With the druid I will do a switch to bear form if it pulls aggro - and will switch to healing him on the shammy, while the warrior gets going trying to reestablish aggro.

If i was starting out fresh I woudl have gone for the pally tank.

You are right though I will have the tank as the driving character (and make sure that my aggro generating abilities don't trigger anything on the slaves until a few have gone off.

(e.g I'll probably have the sunder key trigger castsequence macros on the slaves that do nothing for the first 2 - 3 keypresses, then start the nukeage.) But the configuration will happen over time.