Best Italian in North Beach for a group of 6???
Hmmm... if you go at off-peak hours you maybe could do L'Osteria del Forno, but they don't take reservations and all the tables are 2s and 4s so they'd have to put two tables together for you.
Does it have to be ON Columbus. Trattoria Contadina is nice. A little pricier than some of the other North Beach stuff but not too bad. I've been there with bigger groups and had good experiences.
We had a group of about 12 las year at E Tutto Qua and it was excellent.
http://www.etuttoqua.com/ Very good food, great service.
We ate at Figaro 2 weeks ago and had a great meal. I had Risotto with Beef Ragu and DH had lobster ravioli with Meyer Lemon sauce. Both were very good. We ate early [6 ish] midweek and it was pretty empty. Got busier as we left. Good service too.
414 Columbus Ave, San Francisco, CA 94133
E Tutto Qua
270 Columbus Ave, San Francisco, CA 94133
I go regularly to meet friends at Capp's Corner in North Beach for cocktails & cheap dependable family-style Italian food. It's not a high-falutin' gourmet treat but I've never had a bad meal there and i always have a good time. Lately I've been drinking Manhattans (their glass wine is okay too, nothing remarkable, but well-priced) and having Italian sausages with peppers and polenta. My friends usually have the Petrale Sole or New York steak. It's convivial and doesn't break the bank.
If you provide more information, you may get more focused responses. For instance, I have no idea what you consider a reasonable price. Nor is it clear if you'd like a particular type of Italian.
I'm going to Ristorante Ideale tonight, which serves great Roman food and is, I think, reasonably priced.