Earlier in the week, we explained that experts have projected that U.S. home prices will appreciate by approximately 5% in 2013. We also revealed the Mortgage Bankers Association, Fannie Mae and the National Association of Realtors have all projected that the 30-year mortgage rate will be at least 4% by the end of 2013. If we assume that prices and interest rates will rise as projected, here is the monthly difference a buyer may pay if they wait a year.