My system used to be to grow the things that are more expensive, and just buy the cheaper things.
I'm not doing a garden this year as we live in a very small town in a rural area and the classifieds are full of people who give away their excess for free, or very cheaply.
I'm still growing herbs though as they are pricy, and I love fresh ones. I've found so many uses for herbs and have really gotten to love them. I put fresh dill in scrambled eggs a few years ago and love it. I figured if it tasted good in egg salad or devilled eggs, why not? lol
I do like your salad idea though. My sister once named her garden rows after foods. A lasagna row (tomatoes, basil, oregano etc).