I am a huge LC fan and have quite a few pieces.
I would really think about buying a full range all in cast iron, as sometimes you do just need a simple light pan option. Something like boiling an egg or (as we do), pasta, making stove top popcorn ietc, s just easier if you have a basic pot/pan for this. Easier to drain too.
These are my most used:
Balti dish - this similar to a wok, but smaller with higher sides. This is my go to for most things, bolognaise, mac and cheese (and you can put it in the oven to grill the cheese on top), roast potatoes and the list goes on. Used at least 3/4 times a week.
24cm dutch oven is next most used. Everything from curries to stews to roasting chicken/meat etc.
Oval dutch oven. I wouldn't buy this again, the round dutch oven is just better with higher sides. I use this oval one for making sourdough mostly.
Skillet - My most least used pan. For what I would use it for, the top two work just as well. The sides are a bit shallow for anything too voluminous, so I really only use it for steaks. For basic frying of eggs etc, I use the Tefal instead.
And if I had a whole collection of every pot/pan being in cast iron, my pan storage drawer would not cope too well with the weight of them.