After five years of sitting on the sidelines, Augie Byllott is ready to throw his hat in the ring and make some offers on short-sale properties. He'd bought several before the housing bubble burst. "But when the market changed, I stopped," said Byllott, a managing member of Homeowner Resource, a Champions Gate, Fla., real estate investment firm that buys mostly foreclosed properties. "The short-sale volumes grew so large the banks didn't have the