State Farm, in Cali, about 1500/yr. I have it insured for <2500 miles year, which I don't find restrictive at all since I'm only driving it about 800-1000 miles at this point. What I like about them, vs. Hagerty and others is there are NO restrictions on where I can drive it. I can take it to work, school, shopping, dinner, movies, home depot, car shows... anywhere I'd take any of my Daily Drivers. I didn't like how Hagerty limited where you can drive it, what's the point if they're going to do that?? Also, I've seen people insuring these cars with Liability limits of 50k/100k... to save a few bucks, please don't do that.
Also, in Cali they insure for replacement cost based on other cars advertised at the time of the loss. I did a stated value, but that's a moot point as pretty much all the cars for sale now have a higher asking price than what I paid for mine 4 years ago. I have heard that NY/NJ/CT (Tristate area?) has generally higher insurance costs across the board (maybe it's that no-fault thing I think those states have).
I haven't had a need to file a claim with SF though, so I can't speak to how good they are in that regard. Also, I have Mercury for my other cars (they wouldn't insure the G) and home policies. But I noticed if I switched all my home/cars to SF, my total rate would go up, so I just keep the G on SF.