My favourites are:
Mannaja
Lucky Johnny (A really dark western from 1975, the main character picks fights with people to help his grandpa's cemetery business, a nasty violent western)
Last of the Badmen
Barrel full of Dollars ( IMO Fidanis best, and the crazy Kinski )
Dead men Ride!
Il Mercanario (The Arena..)
No Room To Die
Django the Bastard
Keoma
Wrath of God
Vengeance
The Holy Ghost trilogy
Black Jack
Ben and Charlie
Born to Kill
They Call him Cemetery
One dollar too many ( I don't know why, but I really like this mix of comedy and shootings)