Engineering or Blacksmithing or... Both?

So I still want to make my Worgen an engineer... I mean who can say no to rocket boots, invisibility, and explosions? But I also discovered a number of blacksmithing crafted epics, such as a very nice shield Elementium Earthguard, a chest piece Elementium Deathplate (yes it's 'DPS' but 228 Mastery is better than 228 Parry), a belt Hardened Elementium Girdle, and a blue weapon Elementium Bonesplitter. Combine these with the epic helm from engineering Reinforced Bio-Optic Kill Shades and you have a fairly good start on your heroic / pre-raid set. This helps out in two ways for tanking. First : You can never have an over geared tank. Don't get me wrong, each member of the group has just as much responsibility as the others, but while you might can carry a dps, you cannot carry a tank (and by the same means a healer) until you vastly out gear the dungeon. I don't think that will be happening for a very long time either. Having a head start on gear will help out with your survivability as well as the chances you'll be successful in completing the dungeon. Second : this frees up a large investment of justice points to fill holes in your other gear faster. Things like shoulders, hands, legs, and neck pieces. Another benefit to also pick up blacksmithing is that you can sell these crafted epics for some nice gold. The trick of course will be to get the recipes for these epics. As of this posting I have no idea where they drop, be they raid / rep / heroic. The only thing I'm not looking forward to? Farming up 600 copper, 481 mithril, 622 thorium, 604 cobalt, and 891 saronite just to get to 450.