I grow several Austins here in Montreal (hot and also HUMID summers)and they do very well. I spray with sulphur in the spring, after pruning, and Safer's Defender in late summer, if needed. The only time I get a little blackspot is if we have a very cool, wet spring, and sometimes in the fall, if it's damp (I have no BS so far this season). I do get powdery mildew on a few that aren't on your list. Every area is different, you won't know for sure until you try. As others have said, they have varying degrees of winterkill depending on the winter, but they all bounce back and are blooming by early June no matter how low I've had to prune. I've never lost one in the ground (mine are planted around 2 inches deep, so I do mound them with about 10" of soil in November, just in case. Planting deeper will eliminate that chore).
You will love their beautiful and fragrant blooms.

These have all come through winter beautifully (grafted on multiflora, unless otherwise indicated):

Graham Thomas (own root)
Charlotte (own root)
The Prince
Sharifa Asma
Evelyn
Tamora
Heritage
Janet
Pretty Jessica
Jubilee Celebration
Abe Darby
Jude the Obscure
Spirit of Freedom (own root)
Crocus Rose (as everyone has said, the least winterkill)

Judith