Welcome from the Netherlands.
Sounds like you have a varied collection already! Maybe to expand on it, you can look for the stuff that you feel is still missing?
I would strongly advice looking at the offer of Direct Service items, since they have some great western and medieval stuff there you cant find in the stores, and which tends to be very expensive on ebay and other second hand markets.
Personly I am gathering all the steck houses that got released since I started collecting a few years ago.. already have the bakery, a yellow house, the museum and will get the blacksmith this year. It's already enough to create a nice village and with a little camera trickery it can even look like a city.
But seriously, direct service is your friend.