As the MT my aggro depends alot on my ability to hit the mob, therefore Weapon Boon is always very high on my Wish List
Especially when fighting hard mobs that force you into defensive stance which gives -melee skills.
My Wish List:
Hyran's (Master II of course ;) )
Percussion of Stone
Riana
Weapon Boon
Dead Calm
With free PoS Athletic Strain or Screeching Elusion would be next, depending on the fight.
Group Setup is Guardian, Templar, Defiler, Swashbuckler, Dirge, Coercer.
If you run with a Warden instead of the Coercer, you can let him buff MT melee skills, but then you have to turn on Power Ballad, so there is no real gain ;)