US home buyers remain worried about the economy. But with average home prices down about 30% nationally from 2006, mortgage rates low and federal tax credits still in play, more than 80% of buyers see this as a good time to purchase, a Century 21 Real Estate poll found. The First-Time Home Buyers and Sellers survey by the Realogy Corp. unit polled consumers who bought or sold their first home within the past year or planned to do so within the next year. "Today's market presents a generational opportunity for home buyers and current home owners looking to leverage their market position," Rick Davidson, president and CEO of Parsippany, New Jersey-based Century 21, said in a statement.