i'd trade out the prot warrior for a bear or dk, or even another pally, warriors require alot of micro managment, and running 10 toons you are going to have your handsfull anyways. Both pally and DK are easy to macro through castsequence, and both are aoe tanks, if you do use that combo i would suggest running the dk as the "main" and have the pally iwt.
Warriors seem to be superior in holding aggro for single targets but suck at aoe tanking, so if you do keep the warrior he will be good on bosses or loose adds, but i wouldn't make him the main tank, espically for pulling trash.
But in the end it's all up to you and what you find to be fun.

Other than that i can't really comment, i have always run casters as the dps with my groups.