I believe in the following link, you will find a good discussion of how to evaluate a market:
The problem with trying to say "WHEN" a market will bottom, is that basically, the speed of the decline is subject to unobservable phenomena. If the government makes foreclosures require a 2 year delay, well, the bottom gets pushed back 2 years. If suddenly, everybody got a 100k tax credit to buy a home, well, obviously the market would do an about face instantly!
So, since it is impossible to guess what changes to current market conditions will come due to governmental meddling, any prediction based on today's characteristics if fallable. However, outside any of these changes, the current observables can be used to estimate what will happen next.
best of luck on your move!