Beer shopping in Belgium

In 2 weeks I'll be in Belgium visiting the family. In addition to the compulsory chocolate, mayonaise based sauses, dry sausages and children DVDs (not for me) I should have some free space in the luggage for some beer. Well, I'll make some place. I'll try to book a crate of Westvleteren 12, alternatively try to by some in Café De Vrede next to the brewery. It's a nice area, so a visit to the area is never wrong. In addition I'll try to drink and buy home as many interesting beers as possible, not the least saisons, gueuzes and rare brews from tiny breweries. Maybe the new Sint-Amatus from De Struise? After all, Oostvleteren is very close to Westvleteren! My God, my mouth is already watering. If you know an interesting Belgian beer I should try while there, suggestions are welcome!