Because I'm relatively new to the forum, and in case anyone cares, I love:
VIOLENT NAPLES
ROME ARMED TO THE TEETH
(the Merli/Lenzi/Micalizzi combo can't be beat for "pure action")
STREET LAW
REVOLVER
(my favorites of the films that seem to be saying something deeper)
MEAN FRANK AND CRAZY TONY
THE SQUEEZE
THE PERFECT KILLER
(I'm a sucker for Lee Van Cleef; wish he would've done more crime movies)
THE OUTSIDE MAN
FAREWELL, FRIEND
(my favorites of the French crime cinema)
MANHUNT
(the Di Leo/Silva one -- this is a perfect meeting of score, direction, performance, story.)