I've been very vocal on the forums about wanting them to add the Tr-116 as a Mk XII weapon from the start. i'm looking forward to it greatly. But my problem is that every since the ground update, Melee is now almost useless in most fights. My Main used to be able to drop Heavy Tacs before the rest of the team could even get his shields down. Now in all honesty, i haven't done any STF's in a while due to lack of incentive, though considering some of the new STF changes coming i might need to get back into them.
As for best weapon type, the Ghostbuster is a good one as mentioned, but if you don't want that i'd say Disruptor for the debuff or Plasma for the Chance to ingite.