Ok, thanks so much for all the info on the varieties and I will make a raised bed thanks. I will look for the Montgomery. Should I try a 350 chill hour plant when I am in the 800 chill hour zone? I don't know if I should try early blooming ones or not because lately we keep getting a late frost that won't even let our fruit trees set their blooms.
That is a good question. Do not take this as the gospel, but my experience with blueberries (in the south) is that chill hours are more relevant for whether or not you have enough. They are early bloomers anyways. They will bloom with the first warm weather of the spring. There will always be a risk concerning blueberries in the south. Bushes pruned to 5' tall are not hard to cover with sheets, unlike trees.
For an 800 chill hour area, I would stay away from the excessively early bloomers like Climax or Woodard.
I would think along the lines of higher chill hour plants, but the chill hours do not tell all of the story. Chill hours is a need to bloom, not necessarily when they will bloom. For example Brightwell is a 350 chill hour plant, but blooms with or just before Tifblue, a plant with almost twice the chill hours.
All of the varieties you mentioned are worthy of consideration, and will do well there (as far as chill hours). I have all of them except Climax, and live in a similar zone. If I was to suggest 10
varieties for your area I would say . . . . Tifblue, Powderblue, Columbus, Ira, Briteblue, Gardenblue, Beckyblue, Brightwell, Premier, and Centurion.
A mature rabbiteye can give 15-20lbs of fruit so . . . . 8 plants is enough for most households. 12 certainly is.
Now think about cross pollination. In the above group, Premier is the outlier, but should overlap with Brightwell.