estimating future ARV

[Michael Buttram]

Thx ok,  here's a question for the smart people:

When attempting to estimate a property's ARV "potential", how much weight do or would you put on sales that occurred right before the bubble burst, I.e, 2008-09, as reported by zillow, trulia, etc? I'm thinking in context of a buy and rehab and rent for a few years, trying to ride the next cyclical upswing.

Thanks