Personally, I wouldn't, but I guess it depends on which shield you're using. I can't see what you're currently using (armory looks to be down), and which/if any Prot tier pieces you have, but since you said you don't have the Prot gloves, it might be worth saving your coins for Nazgrim when you get to him.
-edit-
Oh wait - I replied thinking you meant tier chest. I would probably still coin since the Ordos chest is pretty meh. If you don't have your 4P yet, doesn't hurt working your way towards it. That said, if you're debating over using your last coin on Sha or one of the other bosses, I would probably pick the latter.