Understood style69
ok This is my point:

1-The Godfather
2-The Godfather Returns(the other may not agree but If I were you I would do it to compare)
3-The Sicilian(Because of Michael in Sicily
4-Omerta
5-The Last Don
6-The Fourth K
7-Fools die
8-The Dark Arena
9-The Fortunate Pilgrim
10-The Family

I didn´t read 6, 7, 8 and 9 I am just guessing