If you liked LEON may want to check out the original
LA FEMME NIKITA. Both were directed by Luc Besson, and I think Nikita is actually the better flick.
John Woo's 1989 "heroic bloodshed" epic:
THE KILLER might also be right up your alley. Most people love this movie, although I have to admit that I'm not personally a fan of John Woo's work.
... And as an aside, I love how Edward Fox in DAY OF THE JACKAL always jacks his pants up to his armpits like an 80 year old man. Kind of funny to see a guy who's supposed to be a badass wearing his pants like that. [img]/images/graemlins/laugh.gif[/img]