I just plugged the numbers into Tim's spreadsheet.
Median price on KC SFH is down 5.7% this month.
That's about twice what I expected. Wiped out half of the year's gains.
To temper the enthusiasm, Sept looks like it is usually one of the weakest months of the year for price increases. It was negative in both 2005 and 2006 -which were banner years for appreciation, and close to zero in 2004