Start answering that question yourself buy researching the areas in detail.
This site is one of many your can use to make an informed decision on your own terms,others I am sure will offer opinions on what they do to research an area.
This site will give you heaps of info on the demographics in the area.
And yes, very affordable. Lots have subdivision potential as there are large sections of medium density. There is a pdf map of these areas I was using.