There are a couple of stalled subdivisions in northeast Escondido that I am watching. However, the owner is being very stubborn on price. He expects bubble prices.
There are other possible subdivisions but they are probably way too north for you to consider. The County is trying to build a road from the 15 to Valley Center, and someone will probably start looking to develop there. However, it will take 10 years for it to be finished, even if they started their application today.