Some makes we forget about:
Pogliaghi
Chesini
Fiorelli
Fausto Coppi
Rossin
Picchio
Guerciotti
Basso
The top dogs are Cinelli, De Rosa and Tommasini. Build quality is frequently stunning for any of them.
And, yes, Colnago bikes are twitchy. I can't go more than five miles on mine with out it trying to toss me into the ditch.