Interesting. Thanks for the feedback. I thought of zillow.com, but don't trust it because it doesn't have the specs of my house correct since it's been remodeled. We bought our house in October of 2012, and shortly after received a tax appraisal that was done in June of 2012. The appraisal quoted the value at $6k more than we paid for it. So, our purchase price is more updated and conservative, but our appraisal was based on more actual data. And, for reference, zillow.com says our house is worth ~$36k less than we paid.
So... I'm thinking maybe I should use our purchase price. You agree?