OK, so it seems to have Princess and Dragon, Traders and Builders, and Inns and Cathedrals- I imagine the river is an expansion that's basically become part of the base game, even though my family's set doesn't have it. Of the others:
I don't recommend Princess and Dragon, as it introduces what's basically an attack mechanic or two- a dragon that eats meeples, and princess tiles that let you kick opponents out of cities. It also fundamentally changes the game by sometimes letting you place meeples on already-placed tiles. I feel like Carcassonne with this expansion is a different and less good game.
Traders and Builders (which you've played apparently) is complicated but still good. It adds to the game- by having cities that produce trade goods as a new way of scoring points, for instance- but doesn't change the core of it like Princess and Dragon does. It also has meeple-pigs which are extremely cute (and meeples with hats).
Inns and Cathedrals is excellent. It's the only expansion (other than the river) that I straight-up prefer playing with to without. It adds a small amount of complexity, and that's all. It also makes finishing your roads actually worth something!
Also, this website seems to have 7 Wonders, Power Grid and Kingsburg!