Black Lagoon - for the simple reason that its not your typically anime shoot'em up that takes place in the south pacific during the early 1990's that deals with a freelance company called black lagoon and its escapades.

Ghost in the Shell: Stand Alone Complex and second gig - first couple of episodes of stand alone are kinda boring but once they get into the main plot of the series the rest of the episodes really pick up and its sequel has been good from the get go.

Golgo 13 - kinda like the jackal in the day of the jackal 1973, except us goverment sponsored, more about the target and there motivations rather than gologo 13 himself who is very blade like in his attitude towards his job, mind you its theme songs sucks.