SW Wisconsin and anywhere in MO have reasonable
land values and lots independently-minded folks.
North Carolina, New Hampshire, and parts of Texas too, though land values can vary wildly.
I put emphasis on being close to a university, culture, and general brain trust, that's why I am where I am. Permies.com is one heck of a virtual community!
The second most important factor in my opinion is: are you homesteading or are you permafarming with need for a market (population density).
SW WI folks have to truck their produce 3+ hours for a strong market. I have 150,000+ people within 30 miles.