I know that feeling very well! Even though I’ve been to Brussels many times and know the major beer stores, the amount of interesting and yet undiscovered beers that are worth being carried home to northern Germany is always larger than the space left in my luggage. ;o)
By the way: That’s a mouth-watering picture you have there! But the wooden rack and beer style signs look more like the nearby “Bier Planet” in Rue De La Fourche/Greepstraat, not “Bier Tempel” in Rue du Marché aux Herbes/Grasmarkt.
Anyway, since they both offer a large (but not identical) variety of beers, I recommend that you go and see whichever one of those you have not seen yet during your next trip to Brussels!