Cole, there are few others I have grown, but they don't fit your needs or in a gallon pot. I'm only suggesting this one because it is beautiful and if you ever choose to sell some larger potted plants in a two gallon pot
http://www.johnnyseeds.com/flowers/m...seed-1884.html but they grew about 3.5' tall for us.
There are some others sold locally that look pretty good
http://www.rareseeds.com/crackerjack...igold-african/ not my favorite, but I see a lot of people growing them.
I understand you are growing for market. Repeat customers tend to spend more. A lot of people do not pot-up or plant in ground, so pot/container size is important. I don't know what grows best in Illinois, zone 6, but in Texas zone 8 - the three I've mentioned in this thread would sell. You could also sell some organic miticide. Price mark-up could be at your discretion
https://www.google.com/search?site=&...63.wWUU7sI3Ytg The first link might sell your miticide without saying a word.