Here's some I like (and can remember LOL):
Berserk
Gungrave
Hellsing (I really prefer the new OAVs)
Record of Lodoss War (I prefer Chronicles of the Heroic Knight since it offers Orson a decent role)
Godannar
Claymore
Fist of the North Star (the new ones, mainly; I'm kind of a whore when it comes to things looking nice and the old television series was too ugly for me to like)
Right now I can't really remember any mango I like except Hellsing, Berserk, and Vinland Saga.