With low interest rates and bubble-battered housing prices in many markets, some are deciding it makes more sense to buy a home rather than rent. Are buyers taking the bait? Recent data were mixed. A fresh batch of reports out next week could shed more light, including earnings from real estate information site Zillow (Z) and contractor supplier Beacon Roofing Supply (BECN). Tuesday morning, analysts expect Beacon to show an 11.8% bump in earnings