Jamie Benn should probably be up there just on account of two pretty egregious cross-checks to other players' (Dylan Larkin and Mark Stone) necks. As soon as you start targeting players necks or heads with your stick or hands/arms, that's pretty bad. He also seems like kind of an overall buffoon.
As for Subban, he had some slew-footing stuff, et cetera, going on towards the tail end of his career when he had lost his speed/explosive step, but on an overall career note he wasn't that dirty.
Matt Cooke was dirty towards the end of his career with Pittsburgh, though he wasn't that bad during his 9 years in Vancouver (I think one 2-game suspension, which is less than Chara should have had just with Boston), and the Lecavalier hit (when with Washington) wasn't that egregious as well, greasy hit, yeah perhaps, but in an earlier era that would have been considered very milquetoast.