Big Bad Beattie can sure hit 'em hard - ask O'Hara.
From Cronulla I'd say he and Nutters are our best tacklers. Nutley is more efficient, but Beats is more of the hit-man type, in the Adrian Morley mold.
For sheer pain, and teeth-rattling impact I have to say Ruben Wiki. The man is an absolute monster. His hits are beautiful.
Morley pulls off some beauties too, but often his are borderline reckless and dangerous, whilst Wiki hits low and drives 'em under the ribs. His tackles are also perfectly legitimate too, unlike Morley.
I still rate Morley as a Hitman though.