Steve is correct. A CMA is the best way to find the value of the property. There are some really good appraisers who can give you the highest and best value of your house.
If you would like me to do the CMA for you, please feel free to contact me at email@example.com or 805.596.4479. Although my office is located in San Luis Obispo, I live in Atascadero and keep a very close eye on the market in the North County.