I suspect the area just isn't big enough to fit into Whole Foods' current expansion strategy. Fresh Market in Destin has also had some good produce lately and is probably as close as the area will get to WF in the medium range.
I just stumbled onto "Fresh Market" in my internet search. I will definately be checking that out.
I'm really surprized that one of the big organic grocery chains hasn't set up shop yet in the heart of South Walton. I think the area is plenty big (and affluent) enough to carry the store.