Last year I found Heacock to be my best buy. Next round I think I'm going to switch to Sneed, after I check into them a bit more. Sneed is quoting about $100 a year lower premium for the same coverage on my rod.
Grundy for the best price. Hagerty has excellent service and product with few limitations. But Hagerty is a little pricey. That's why I went to Grundy.
I've had very good service / prices form Infinity with their Classic Collectors program. I had an accident on the way to the 2007 Nats, did nearly $10K in damage to the car. They didn't give me or the repair shop I chose any problems.
Interesting that my coverage with Heacock is also actually through Infinity. With all the kudos on here for Grundy, I guess I'll have to visit with them in September when my renewal is due. I've been fortunate, in that I haven't had cause to put any of them to the test....knock on wood!