Only one way to generate agro big arse weapon and correct rotation.
I assume you have read up on the correct rotation so that leaves BIG ARSE WEAPON to get. Remember non tanking weapons usually give higher threat because they are slower and have higher damage numbers because they are slow. http://www.wowhead.com/spell=53595 uses only the weapon damage in the calc so the shift in 4.0.1 is to slow dps weapons to tank with as we don't have slow tank weapons until cata.
If you have the honor points the Wrathful sword/axe or mace will last for ages else hit wowhead and check locations of where to get weapon.
** Remember Warcraft players fail in directions you never thought possible.