Surely batch cooking only produces vast quantities if that's what you choose to produce? You could still cook on a Sunday, if that's what suits your routine, but make fewer portions of more things? Then you could have, say, a two-week rotation of dishes in the freezer. I think the answer to your question depends a lot on how much you enjoy 'faffing around' in the kitchen, and how little you want to do each evening. Do you literally want just to defrost and eat?
I love cooking (and eating!) and am prepared to do almost endless messing about, so this might not suit you, but I would be buying:
1 pack chicken breasts: keep 1 in the fridge for 1 evening roasted when you get home with some pepper, onion wedges, courgette and pesto. On Sunday, make a chicken pasta sauce, keep one portion in fridge for Monday, roast the other one to have cold in the week with salad.
1 large pack mince: fry with onions, carrot, celery then turn one portion into bolognaise, one portion into chilli, one into flat burgers which I'd freeze separately to have 1 evening with a roll and oven chips.
Sweet potatoes and a butternut squash: turn into a stew with beans and freeze in portions.
Large pack peas and a pack of good quality ham: make pea and ham soup and freeze in portions. You could even make some bread yourself on the Sunday and freeze it too, if you enjoy that kind of thing.
A couple of salmon fillets; freeze one and cook the other when you get home one evening with thai coconut rice.
HTH!
Good luck with it