Pick a state
If you don't mind flat, Kansas has lots of open area's with very little to no people. Not sure about the government in Kansas, but I do know that every Kansian I have met has lots of guns. Lots and lots of guns.
I've been quite impressed with rural Kansas. Just have to get past the flat. In reality you can get good land, sometimes with trees and water.
Hot like the south in the summer and cold like the mountains in the winter.