LEXIRX330 is right about the variables, make sure you are comparing apples to apples.
I'm 30 yrs old, male, married, no accidents, no tickets on record, and only have 2 car policies through Response Indemnity here in California. Only thing about Response is that they will only accept policies for college graduates. They are by far the cheapest I have found, in fact when I switched from Statefarm, my coverages more than doubled and yet my premium was reduced by approximately $600 each year.
I have the following coverages:
$100,000/$300,000 bodily injury liability
$50,000 Property damage liability
$1,000 medical payments
$25,000/$50,000 Uninsured motorists bodily injury coverage
$3,500 Uninsured Motorists property damage
Full glass breakage coverage
$500 comprehensive and collision deductibles
For all this, I pay $331.10 every 6 months. :D