go to the organic stores what sells for the most that you can grow for the least? my friends brother had a seasonal organic farm 2 acres harvest like mad sell out and spent the winter in Mexico,,did that for years... Personally I grow Quinoa and Amaranth because pound for pound it has more protein than beef, the leafs are great when young in salads, stewed when older and the seeds (the real harves) are just beautiful and very easy to harvest store eat and re seed. Also look into Bolivian Sunroot. (seeds of change.com) I grew up on a small organic farm and ran a landscape and tree care business for 13 years design install etc... I ve seen a lot of people take a single plant and carve a niche. Develop your market as you go, just go. thats the way.
Peace