The "space one" Starfarers of Catan is not an expansion but a completely different game. It is a great game though.
Here is a everything Catan.
http://www.boardgamegeek.com/metasea...ch=catan&B1=Go
The 2 main expansions are:
Seafarers of Catan. I have only played that once, but didn't really like it.
Cities and Knights. I have played this a few times and it really adds a lot more to the game, the only draw back is that it really lengthens the gameplay time.
There are a lot of smaller expansions. Like Fishermen of Catan, it was in the most recent issue of Games Quarterly, I have it but haven't played it yet. The one you mentioned is The Great River of Catan. There was a small one released in Germany recently called Die große Karawane, I was hoping to get it in Games Quarterly but since they have (supposedly) stopped printing I don't think I will be able to get my hands on it.
I don't like event deck.
Got Sheep for Grains?
Got Wood for Sheep?