Your biggest issue is not which variety to grow, but finding or building good soil. While there are pockets of good acidic loamy soils in MTN, it is more typically thin, neutral, clay/chert on limestone bedrock, or if you are up on the Highland Rim, acidic clay/chert. If you have the thin limey soils, then raised beds may be needed. The acidic red clay on the Rim will need lots of organic soil amendments. A soil test is essential. The one variety that has done best for me so far is Ozark Blue. Mine are just coming into good production, or would have been, if not for the big Easter freeze. I do have scattered berries on most varieties, but lost most of the crop on just about everything. Oneal is a good early variety. It needs more acid soil than most, but flowers over a long period, so spring frosts usually only get some of the earlier blooms. Others doing really well are, Legacy, Sierra, Blueray and Aurora. Blueray is probably the most heat tolerant northern highbush. Aurora is very late ripening and also suffered the least damage from the freeze. Star is a newer variety that a friend with a big blueberry farm near Lebanon really likes. It blooms late, but ripens really early. Aurora, Ozark Blue, and Oneal probably have the best fall colors, although most varieties are really good in that area. If you get a chance, go visit Kelly's Berry Farm just north of Lebanon. After many years of growing many varieties, they now grow mostly Ozark Blue, Oneal, and Blueray, along with some of the old rabbiteye standards, Tifblue and Climax. Unfortunately, they will not have any blueberries this year due to the freeze. They do still have some strawberries, although it is getting late in the season. They also should have a good blackberry crop by summer. Avoid the shade as much as possible. I just moved some bushes that got some partial shade. They just did not grow much or produce well at all, but the same varieties out in full sun were doing great. ~kiwinut

Duke and patriot are both earlier varieties that fruit before bluecrop. I also think Patriot tastes better than Duke. If you're going to plant more, I'd recommend also planting some different varieties in addition to the above 3, which are standard, dependable commercial varieties, but aren't necessarily bred for the best flavor (although, unlike some fruits, the commercial varieties still taste good). Legacy is a productive, disease resistant, and very tasty, as is Brigitta. I'd also add a fast growing rabbiteye to the mix (Premier or Yadkin?), a southern highbush (Southmoon is supposed to be one of the best tasting) and one of the season extending varieties such as Elliot or Aurora. Attached is a useful chart with more useful flavor ratings than most (I don't know anything about the nursery). See also the longer list at http://www.fallcreeknursery.com/Commercial/VarietyChart.htm See: http://www.danfinch.com/zone.htm for rabbiteyes (a nursery I do have experience with and recommend). Hartmann's also has a huge selection of blueberries and Edible Landscaping sells potted blueberries year round (both recommended sources). Here is a link that might be useful: varieties

Raphiolepis indica, Indian hawthorn. Here is a link that might be useful: Raphiolepis indica. Indian hawthorn.

There are a number of "best pollinator blueberries" discussions over on the Fruits & Orchards forum that should answer all your questions. Blueberry discussions from Fruits & Orchards forum Dave