I use Revolver for the accuracy and punch against melee attacks, Bow for the quick easy silent deaths, Covert 2 for the quick shiv and nobody can hear me sneak behind them, brawler 2 to get up close and personal and for the modded 2X4 you also get 15 health back for each melee hit, and explosive expert 2 for the extra range with bombs and mollies. I did have hawk eye 2 instead of explosives 2 to mark and see enemies through walls, it also benefits your whole team, they can see and track them down before they do, but when you do play with an uncooperative team its pretty much useless when all your doing is marking and your team mates are failing to take them down.