David I don't know what local woods you have--I suggest that you check in at this saw mill forum and ask what local wood will make for a long lasting siding.
Buying from a local wood mill can save you some serious money.
And at the same time you're helping a local cutter feed his family
You just need to find out if there are local woods appropriate for your needs.
The Forestry Forum - Index
here is a link to a cutter that has a good list of small mills across the nation. Google saw mills Kentucky-see what turns up.
Nelsonwoodworks.biz - Home