TIM MCGRAW and FAITH HILL are selling TWO of their choice Nashville area properties. One is a 17-acre estate that features a 37-room house plus a farm with 12 barn stalls. That one will run you $20 million. The OTHER is a 6,430 square foot house with 6 bedrooms and 6 bathrooms. No word on the price but they paid a little over $2.5 million for it back in 2004 . . . so there’s your starting point.