I like crit over AP. 3% crit does more for my tank gear than 250 AP does (~15k armor). So I go with cruelty over AtT.
I'm still thinking over imp revenge and incite...
I use revenge a lot during tanking, and I use HS much more often now, given that I glyphed for revenge and HS.
So I'm currently rolling with a
5/5/51 build.
As for Fury/Arms builds. I'm not going their tell 80, since I'll instance my way to 80, I should be prot to make things easier... And most of my gear is oriented towards PvE tanking anyhow... That's my 1/50 $.