Moo,
I saw "Once Upon a Time in America" a long time ago. I don't remember much about it except that I liked it. I have been wanting to see it again and probably will buy it but not until it comes out on DVD (I hate watching movies that are not letterboxed).

What you said about must-see movies was right on, but your list was incomplete. Here are the movies I consider must-see. IMHO every Mob movie fan should own these:

GF trilogy
Goodfellas
Bronx Tale
Donnie Brasco
Mean Streets
Gotti
Scarface
Carlito's Way
Sopranos season 1 & 2

"My offer to you is this..nothing. Not even the fee for the gaming license, which I would appreciate if you would put up personally."
-Michael Corleone to Senator Pat Geary.