Return on your seeds

I tend to have a similar thought process with what we grow in the garden, but better taste over the shops is also a big factor for me. I always grow first early potatoes as they taste far better than shop bought. Similarly there is often a few carrots as they are far more carrotty straight out the soil.
Our other staples are broad beans, courgettes, kale, beetroot, globe artichokes, jerusalem artichokes, cut n come again salads, black and red currants, gooseberries and apples. If you count broad beans etc as a good bang for your buck, fruit trees and bushes are another level.