Your tank should be crit immune from talents.. not sure if Fury can go that deep or not.
You'll certainly be immune to crushing blows.

I'd tend to think.. with all the heals and mitigation that Disc brings to the table...
Pain Suppression on round-robin for every boss, for example.
Divine Aegis and PW: Barrier, normal PW: Shield...
You'll probably be okay with a DPS tank.