wpggtom, can you afford to hold an old house in the area you are targetting? With less rent and limited depreciation it can hurt. It's a good option for those with highish income or lots of equity in other property which can be used to fund the holding cost.
I had a similair decision and picked the old house option. Holding cost is about 3% of purchase cost, but the capital growth had been terrific in the past 12 months.