I'm working on one of each class to 80. Currently have 7 80s, but still have DK/War/Hunt at level 63 now and about to start them full-time till I get them to 80 (perhaps this weekend). I may put the Pali/DK/War all on the same account so I can pick and choose between each tank at will. Though I may end up putting at least one on my priest account, then use either druid or shaman healer to mix things up. I want to be able to mix-match just about everything for variety.

As far as micromanagement, it seems like the War and Pali are probably going to be about the same. Liberal use of AoE to maintain agg, individual use of taunt/intercept to pick up adds during a fight. Creation of a robust tank macro will make 90% of the work fairly simple, as it currently does for my pali. I'm going to miss the Captain America shield on the warrior compared to pali for the ranged group taunts/pulls/silence (re: the above mentioned Brann event), but the warrior brings different tools to make other fights easier too (spell reflect, shield wall, shouts, etc).

I'm looking forward to trying the warrior out as tank. Will be a nice change to the group dynamic from pali/DK.