Thanks for your advice, I appreciate it very much!

I feel the market is not good here. Every week, the county has a sherrif sale. I checked the county's website this morning, it listed about 40 houses in today's auction. But there were only 5 houses going into the auction process finally; others may be cancelled or delayed. The default loan amounts are from 300K to 600K. But these loan amounts may not match the market values of the houses. For example, the 600K one was purchased on peak time, 2006. The market value of the house now may be less than $300K. 

Now it properly is the most difficult time of the housing market. I attend the court sales and try to understand the market situation. That can be a great help to my house hunting as well as  my stock trading.