Looks like you are setting up a Heroic/Trash spec vs. a Boss/Raid spec.
I actually have a full block value set that I use for heroics (read AE trash) and I also use the spec in raids for trash.
Glyph of Cleve, Glyph of Devastate, and Glyph of Sunder Armor
Its a pretty ridiculous combo for AE tanking.
Cleave hit extra targets and Glyph of sunder proccing sunder on other enemies gets me at or near 5 stacks of sunders on everything near me rather quickly. All those sunders really start to add-up in the damage department when you get cleave, thunderclap, and shockwave rolling in. Oh and tasty Damage Shield procs and (shh don't tell) my shield spike.
Just some other options that I enjoy.
Hope that helps,
"A man can learn twice as much from milking a cat as two men can from a very tall fourth man.
- Mark "Alec Baldwin" Twain