Havoc load out should simply be a bi-product of what your army needs. Not got enough anti tank? Throw in the lascannons/missile launchers and have a squad of them sit on the back line blowing things up. Need anti infantry? Autocannons and heavy bolters. Want a close support unit for your front line troops? Give them 4 Plasma guns, flamers or meltas and shove them in a rhino.
If you're adding them for pure firepower, look into some Noise Marines instead. But, if you are adding them for anti-tank, look into Obliterators, and if you still need more anti-tank then give the Havocs Missiles Launchers or Laser Cannons if you have enough points.
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