You can not trust the 'Trulia Estimate', the Zillow 'Zestimate' (the 'zestimate' for this property is only $330k compared to Trulia's 'estimate' of $358k), or any other many sites valuations since they each use their own formula for interpreting the public record. Trulia & Zillow are actually the first to tell you that they can be significantly off in value ~especially when we are in a market that is changing, in this case/ area where prices are still going up.
Valuing property is more of an art than a science and you could have ten different appraisers go out and conceivably get ten different values (though they should all be within a reasonable range) depending on the individual research, knowledge of the area, and experience.
If you are looking to buy, sell, or even just refinance, you would really benefit from using an agent. We will have access to the same info that professional appraisers use and will gladly share it to help you to make a more accurate determination of value.