Eh, the main thing is to take extended range and +100% tech explosion damage on snap freeze, cause you can spam that shit through walls. Incinerate is radius, burning damage, freeze combo. Up to you whether you want energy drain or not, I went with a 6/6/6/5/3 build this time around.
Paladin is ok by himself cause he can set off tech combos pretty fast by himself, but if you pair him with a detonator, shit absolutely melts cause he can just spam snap freeze and watch the cryo blasts pop endlessly. Siege pulse works remarkably well in that regard. After a juggernaut, i'd say n7 shadow spamming electric slash would be my favorite detonator. One of the two classes I'm still missing of course.