Now is a good time for young renters to consider buying their first house, according to a column article on Reuters.com today.   Factors making the market more attractive for first-time home buyers:  a housing glut leading to motivated sellers and falling prices, a Federal stimulus bill raising limits on affordable  government-backed mortgages, and low mortgage rates.  The article also offers common sense tips on how to get started.  http://features.us.reuters.com/personalfinance/news/N19600119.html