OK, the last I'll say on the topic, the OP has heard my point of view, which I think you're entirely missing.
My point is, a hardtail is an incredibly versatile bike, and there's plenty of riding everywhere in the country, even in the flat South.
Even those "trails"you describe are more comfortable on a hardtail. a CX bike might be faster, sure, but it's sure as hell not a comfy ride in comparison. The bikes he's listed, will be a great gateway into exploring most trails he'll find around him, and potentially a gateway into something even more challenging.