This is a tough one. Biba's in Sacramento is supposed to be the best Italian restaurant in town. Friends rave about the place, but I have not eaten there. Italian restaurants come and go in Sacramento. Some of the great old mom and pop places are gone.
I think Viconte's in Folsom is the best one that is still open that I have actually visited. We go to Vince's in West Sacramento because my wife's family lives there. Much like Roma's Pizza, the Club Pheasant, and the Espanol, Vince's has not changed a bit in 30 years.
My wife and I have scheduled a family-style dinner Italian dinner at the Sequoia in Placerville for 26 guests. The Sequoia is an outstanding restaurant, not cheap, but possibly the best in the region. They don't normally stage family-style dinners, so this ought to be special. They even allow me to bring my own wine without a corkage fee ander a special arrangement for local home-wine makers.