Millions of Americans bought into the real estate boom with adjustable mortgages and home equity loans. Now rising interest rates are forcing them into agonizing financial choices. Aug. 8, 2006 - When Shawn Howell saw the house in the summer of 2004, he thought he couldn’t lose. The location-close to family and in an upscale subdivision in Louisville, Ky.,—was perfect; the three-bedroom plus loft was just right. The price was a little high at $217,000—especially as Howell's wife, Niki, had just given birth to their second child. But the couple learned they could purchase it with no money down by...