I don't know Neal, New Guineas have always done pretty well for me. The regular walleriana types are more finicky as far as sun and drought. They always want pampering, lots of water. I find the New Guineas more self-sufficient but expensive.
The Dragon Wing begonias are my new favorite annuals.
I started a few from seeds a few weeks ago, they're still tiny. I'm also trying the Santa Cruz this year.
http://www.harrisseeds.com/sto...
Begonias from seeds are such slowpokes!
Wax begonias have been pretty bulletproof for me. They tolerate horrible heat, humidity, drought, and never miss a beat. I have started them from seed, but they're so readily available, and so cheap, that I usually buy them by the cell packs. Last year I paid $1.89 a 6 pack. Not worth growing from seed at that price.
For sunnier areas vincas give a look much like impatiens, too.
Karen