This is what I'm rocking these days. I do have a lot of of the 3rd tier warfront stuff, but the mid tier works great for more generic knight equipment. I also have the Mage tower Ashbringer but I'd rather use the blue/gold appearance... but I'm not touching RBGs with a 10-foot pole =/ So Classic Ashbringer it is.
Head: Helm of Radiant Glory
Chest, hands, boots: Dominant/Demonic Gladiator's Scaled
Shoulders, legs: Middle tier 7th legion gear
Belt: MoP Challenge mode (for the shiny spell effects when casting)