Really depends how nice your town is. If its visually nice with great surrounding landscape/views then you can sell for more, if its a plain flat land town with no landscaping or views then it wont be worth much.
1k by default if you consider your town quite flat and unattractive. You can ask for more if its a nice environment to live in. Goodluck!
if anyone would like to come to my town and give me and est on my plots prices, town 4, blue row, thecorridor
Actually, I plan on asking $1250 for my 10x10 plots, and provide the right level of quality infrastructure to make it worth that price.