Soledad Aviles dreamed for years of owning a home, with a plot of land where he could grow corn and chiles as he did in his native Mexico. So he felt blessed last year when he learned he could buy a three-bedroom, single-story stucco house on West La Verne Avenue in Santa Ana. Referred to a local loan broker by a trusted friend, he borrowed the entire purchase price of $615,000 from Washington Mutual at a high interest rate typical of sub-prime loans. The monthly payment, as he says he understood it, would be $3,600 -- steep for a glass...