Possibly a few percent. You’re asking how much less pricing will be 6-8 months from now. The answer to that is that the amount of change during that time period will be about 70% of the rate of annual change, which in those areas hasn’t (yet) been that much.
Pricing doesn’t change that quickly, especially on a declining trend. It will just bleed out a little.
I’d tell you that if your money matters to you more than the intangible benefits of owning a home then you shouldn’t buy at all in 2008, and probably not in 2009.