I garden in South Dakota. Ground Cherries are everything as advertised. I *adore* ground cherries. They will reseed so if you plant them once, you will probably not have to buy seeds in subsequent years. If that might be a problem, locate plant accordingly.
This year I am planting a tomatillo that is supposed to be sweet, the Queen of Malinalco. Last year I planted the Amarylla tomatillo, but didn't find it as sweet as I was hoping.
Strawberries will give you a crop the first year if you buy plants, although not annuals. I am planting strawberries in pots this year, so for me they will be annuals until I find a variety I like. Not sure if my soil but they keep tasting sour. Maybe I'll have better luck in pots.
Great question!