Any idea of the period you're looking for?

I'd think anything high-end from the 50s would be pretty sweet from most Italian makers.

A Bianchi from the 60s would be killer. Or a Cinelli, even better.

Colnagos and Masis ruled in the 70s, DeRosa was an up and comer. Early Pogliagis are highly regarded.

80s-90s-00s, I don't know, not really my time period; eveything seemed to kind of blend together for me.

But honestly, anything from the upper end is going to be a pretty fine bicycle. Avoid the Firenzes...