I'd say go for the gloves. The trinket is cheaper and you can pick it up later if you want. The gloves are gonna increase your threat more than the SBV will. Plus you have the Commendation already, which is really nice. Pair that up with the Coin or the Moroes trinket and you are good.
I guess if you are planning on leveling prot in the expansion, getting the Autoblocker would be more enticing. But for CURRENT content in LIVE WoW, the gloves will do you more good.