[cjameskeller]

I think you would be able to find what you're looking for at the edges of many metropolitan areas. I'm about 30 min (<40km / <25mi) from the regional city of half a million people, and it's very possible to get that kind of acreage here. I'd base your search on other factors, like climate, education (if you have or will have kids), political stability, etc, and come up with some regions to dive into in more detail.