Insurance for my plane runs about $500/year (plus or minus, it varies each year). That includes not-in-motion (aka parked on the ramp), and in-motion (taxiing, landing, or flying) coverage. It is significantly less than my auto insurance.
Things that affect the rate is pilot experience (hours), time in type, where the plane is kept (tied down or hangared), how much hull value you place on your plane (replacement cost), and what sort of coverage you want. Some people even go without insurance, but that would be up to you. There is no requirement (like in auto insurance) to even have any, and no mandated minimum level.
