Pete...I think permaculture would be a great read for you. I have setup a system. Where there is an overlap of different fruits and veggies. Mainly fruit, I have multiple different strawberries that are available different times, blueberries, grapes, pears, apples, raspberries, hardy kiwi, peaches, blackberries, figs. This is all going on while the veggie garden is happening. This is all happening in a typical suburban lot.
To expand it further I have grafted multiple varieties on my peaches, pears and apples that fruit all at different times. I have designed my backyard to be 70% fruit that returns each year with little maintenance and 30% veg garden which require quite more work.
Like I stated before one or multiple varieties overlap as the season goes along.