You have limited space and energy to grow food. This means, in turn, that you need to choose for nutrition and total required space.
Based on this, your first stop should be looking at staple crops from real life. These are things that are grown as the primary means of feeding the population due to the combination of being relatively easy to grow on large scales and being rather nutritious. Wikipedia has a nice page about staple crops that includes nutritional info on the ten most widely grown staple crops. Out of those, I'd probably say a mix of quinoa and soybeans is your best bet as a set of staple crops. Both are not too hard to grow with hydroponics, and their nutritional values complement each other pretty well.
From there, you need to look at what crops will shore up your nutritional requirements. Provided you have people eat the quinoa raw (it makes a great snack, and it loses a lot of nutritional value if cooked), you've only got two big things you're missing out on significantly:
- Carotenoids (vitamin A, β-carotene, and xanthophylls): Easily covered by adding carrots, sweet potato, kale, or spinach.
- Sodium: Beetroot, celery, and carrot all help cover this well.
From there, it comes down to a bit of variety. Onions and garlic come to mind as they're both easy to grow, really versatile, and onions provide a natural source of fluoride, as do almonds (not as easy for hydroponics, but they're really nutritious and provide good variety. Fruit would be good too for variety, but you can probably pick this mostly for taste and presentation instead of nutritional value (brambles might be decent, they're so easy to grow that people have trouble getting rid of them), as would some spices. I'd probably also throw in a true cereal crop so you can do things like make bread and noodles (personally I'd probably go with wheat, but barley, rye, or millet would also work).
Now, you can get a reasonably balanced vegan diet this way if you pick carefully, but you are almost certainly going to be better off if you also grow some livestock. Chickens would be my choice for this, because they give you both meat and eggs (and eggs are insanely useful from a culinary perspective), don't need much space, and can be fed with the same crops that you're using for the humans.