T 7.5 Valorous > ( T7 Herosim = Engy)
As stated the engy helm is awesome from 72 up until you get one of the naxx helms and the Valorous is a clear upgrade imo. Hit is always needed and as stated there is expertise on almost every other piece of gear including the T 7 and T 7.5 set pieces.
I'm Blacksmithing and Engineering, I could drop engy for mining to get the extra 500 health but it won't really make any difference other than making blacksmithing cheaper and I enjoy the versatility it gives me. The shield is awesome for a tank just hitting 80 plus the sockets on bracer/gloves make bs one of the top tank professions.