Hi Bikedreams,
I’m from Belgium as well (living in Namur, working in St Truiden).
I bought my Strida LT from the online shop http://www.fietskopen.be/nl/fietsen/vouwfiets-kopen. They have physical shops located in Aarschot & in Ardooie.
Their prices are very competitive (LT: 578 €, SX: 600€, MAS: 799€), which motivated me to buy there. When I bought mine, they mentioned they had some Strida bikes in their shop for trial.
I would personally advise you to buy the MAS as they seem to still have it in stock and at a reasonable price. It will allow you to go faster than the SX but still have good climbing abilities (see here: [url]My Strida LT with SD is a good climber]). It is a much cheaper alternative than the heavy EVO and than a Schlumpf Speed Drive retrofit. The MAS has 16" wheels which might better suit your girlfriend.
You can contact me by PM if you wish, I speak both french & flemish. A test of my bike is possible.
Regards,
Simon