LOTS of great Italian manufacturers:
Colnago, DeRosa, Pinarello, Bianchi, Basso, Olmo, Masi, Rossin, Gios, Guerciotti, Ciocc, Tommasini, Zullo, Moser, Masi, Cinelli, Bottecchia...
Not a complete list, mind you! Pretty much any of these are great to ride, great to collect.
Bianchi would be the only one of this list that would have made "lesser quality, not-so-much collectible" bikes. But only because they had a pretty broad range of price points that they were hitting back in the day. Most of all the other manufacturers pretty much stuck to making high end race & touring bikes.