Any must-have DLCs from S3/4 ?

I'm coming back to the game after a long break. I played with s1 DLC, bought s2 DLCs but never played with them. A mate tells me they're all great, but I don't really want to drop 50 bucks in Anno DLCs, might be a bit overwhelming too to get back in the saddle with all of them ?

Any particular recommendations ? What's best, what's not so great ? Thanks