The Dunstans don't have great flavor, some have shells that split, and some produce small nuts. Chinese chestnuts don't grow that well in our dry California climate (at least not in the hot Central Valley) but they grow well throughout the Midwest, Southeast, and Northeast. They are resistant to blight. Greg Miller has grown many different varieties/selections and is growing some of the best Chinese. The University of Missouri has been working with chestnuts quite a bit and has grown quite a few of Greg's varieties. You can find information at
The Center for Agroforestry at the University of Missouri. I have known the folks at Missouri for many years (three staff members came to the international congress in Portugal in 2004) but at least two people working with chestnuts were let go last fall due to budget cuts.
The varieties I grow generally would not do well in Alabama and would likely die from blight in a short period of time.