In Zone 7B you should be pretty good for most all. With your summer humidity in AR, I would give them some afternoon shade if possible.
I'd start with tectorum types (most smooth-leaved hybrids) , calcareums, heuffeliis, and the rollers should all be fine there. If you have only full sun, start with the heuffs and rollers and I think I would wait until FALL for all of this. They will make roots better in cooler weather.
A plan B would be to buy now and put them in pots in the shade and move them to their permanent sites in the fall. Even here in Oregon I lose plants transplanted in the summer.
Kevin