julian jackon the g-man nigel benn and of course iron mike, way too many more to list though. ill just conclude with throwing in tua and foreman.
surprised no one mentioned rafael marquez. Hes got good power in both hands, even that jab is pretty stiff... didnt he knock someone down with like 3 jabs in a row before? He's a bit like Vitali, not so much 1 punch KO power but "heavy handed" meaning that pretty much every shot has good power on it even when it doesnt look like hes trying.
Danny "the green machine" Green. This is a guy that has put several opponents down with his jab let alone his right overhand. RJJ will be the next to feel his power:hey
Tyson. Saddler. Wilde. Langford. Shavers. Foreman. Jackson. Pryor. Ketchell. Dempsey. Baer. Louis. Maybe Valero if I see him up against some elite competition.