Colapsar Torpedos .. lots of them, they work real nice, especially if you can catch two enemy side by side
edit: .. well, okay .. don't need lots, but they do work best .. the AOE effect of the Nova Disruptor is only useful if you can corner a couple of enemy (and quite a few of them are too smart for that), or they happen to be surrounded by their own seekers .. otherwise, it's basically only slightly more powerful than the Quantum one with the same range ... torpedos have unlimited range
also, have only seen one place to get the Nova Disruptor if you chose to fight .. from the contact you meet in Quthor