When Casey Johnson and his wife moved to San Diego County three years ago, they couldn't find a home in their price range. So they did what they thought was the sensible thing. Rather than over-leverage themselves with a risky mortgage, the couple rented an apartment in La Jolla and waited patiently for the housing market to drift back to earth, hoping they hadn't missed their chance to become homeowners. The value of a rate freeze Graphic The value of a rate freeze click to enlarge But now the government-brokered plan unveiled Thursday by President Bush to ease terms on...