50 expertise is wholly unnecessary. 26 is a nice goal but again not crucial. I always suggest going with whatever hit and expertise is on your gear, maybe use a couple purple gems but certainly not a red or orange one. So definitely replace your threat gems with more stam, and your bracer enchant with +40 stam.
One thing that would help a lot with AoE threat is replacing your Sunder Armor glyph with Cleaving. Having Cleave hit a third target is amazing for 5-mans.
Your spec and glyphs look good otherwise. Personally I prefer 2/5 Shield Spec and 3/3 Focused Rage unless you're into raiding (more rage = more Cleaves) but that's always personal preference.
For other gear, just whatever other pieces you can grab from 5-mans, like RImefang's Claw or the reg HoR shield. If you have a bit of gold, consider the crafted bracers or better yet, crafted legs (bonus armor... mmm).