Soon I will go to Belgium to a TGV station in France.  Would like to find connections where I don't pay much more than the cheapest tickets and for example:

 1. Have an overnight connection with good timing. or 
 2. Have a decent stopover in a nice location in the day.
or
 3. Avoid Paris.

(3) is for not having to travel with luggage between different stations.

The fastest connections are like 8 hours.  We can spend up to ca 30hours.
Normally there will be one stop anyway.