Best, cheap Insurance

We have State Farm for all our autos and motorhome. We did get quotes from Good Sam because we have them for roadside service and extended warranty for the motorhome. I thought they would be cheaper but they ended up being about $900-1000 more. I hear Mercury is good but don't know about their coverage for motorhomes-RV's. I do need to get some quotes again though; I think it's good to shop around from time to time.